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Former CDC chief says she was fired for resisting RFK Jr. orders on vaccines

Former Director of the Centers for Disease Control and Prevention Susan Monarez testifies before the Senate Committee on Health, Education, Labor, and Pensions in the Dirksen Senate Office Building on Sept.17, 2025 in Washington, DC. (Photo by Kevin Dietsch/Getty Images)

Former Director of the Centers for Disease Control and Prevention Susan Monarez testifies before the Senate Committee on Health, Education, Labor, and Pensions in the Dirksen Senate Office Building on Sept.17, 2025 in Washington, DC. (Photo by Kevin Dietsch/Getty Images)

WASHINGTON — Former Centers for Disease Control and Prevention Director Susan Monarez testified before a U.S. Senate committee Wednesday that she was fired after just 29 days because she refused to pre-approve vaccine recommendations or fire career officials for no reason. 

Monarez, who was nominated by President Donald Trump earlier this year and confirmed by the Senate in July on a party-line vote, became a central figure in the country’s debate over public health last month after she refused to resign. 

Monarez testified that during a meeting in late August, Health and Human Services Secretary Robert F. Kennedy Jr. told her she needed to commit to approving upcoming recommendations from the Advisory Committee on Immunization Practices without reviewing any data or research. 

“He also directed me to dismiss career officials responsible for vaccine policy without cause. He said if I was unwilling to do both, I should resign,” Monarez said. “I responded that I could not pre-approve recommendations without reviewing the evidence and I had no basis to fire scientific experts.”

Monarez testified before the Health, Education, Labor and Pensions Committee during the nearly three-hour hearing that she told Kennedy if he didn’t trust her, then he could fire her.

During that same late August meeting, Monarez said Kennedy told her the childhood vaccine schedule would be changing in September and that she needed to be on board with that.

“We got into an exchange where I had suggested that I would be open to changing childhood vaccine schedules if the evidence or science was supportive,” Monarez testified. “And he responded that there was no science or evidence associated with the childhood vaccine schedule.”

ACIP is scheduled to meet Thursday and Friday at the CDC’s headquarters in Atlanta, Georgia. 

Kennedy testified before a separate Senate committee earlier this month that he did demand that Monarez fire career CDC scientists but said he didn’t tell her to accept the recommendations of the vaccine advisory panel without further review.

“What I asked her about is she had made a statement that she was going to not sign on and I wanted clarification about that,” Kennedy said at the time. “I told her I didn’t want her to have a role if she’s not going to sign onto it.”

Vaccine safety at issue

Monarez said that undermining vaccine safety will lead to an increase in preventable diseases, some of which have long-term or even lifelong consequences for children’s health. 

“I believe that we will have our children harmed for things that we know they do not need to be harmed by — polio, measles, diphtheria, chickenpox,” she said. 

Former CDC Chief Medical Officer Dr. Debra Houry told the committee there are significant ramifications if the new members of the Advisory Committee on Immunization Practices, who were appointed by Kennedy after he fired all of the former members, don’t use rigorous science and data to make their recommendations. 

“It’s going to be heartbreaking,” Houry said. “I think what concerns me is these aren’t harmless diseases. We just saw the case in California of a young child that died of encephalitis years after measles. These diseases have long-term consequences and in the U.S. we have gone so far in reversing this. We don’t want our children to die.”  

Houry was one of several CDC officials who resigned after learning about Monarez’s firing, which happened just weeks after a gunman opened fire at the CDC’s headquarters, killing a police officer. 

Both Monarez and Houry testified, in response to a question from Connecticut Democratic Sen. Chris Murphy, that confusion about vaccines and CDC recommendations had real consequences. 

“I myself was subject to threats,” Monarez said. “And I am very concerned that the further promulgation of misleading information will undermine not just the safety and health of our children, but it will also exacerbate some of these tensions — the willingness to commit harm if someone is affronted by a belief that the people like us that are trying to help them are actually not trying to help them.” 

Houry told the committee the gunman fired about 500 rounds, with approximately 180 of those hitting the building. 

“Each bullet was meant for a person, and each of my staff were very traumatized afterwards,” Houry said. “I had staff that were covering their kids in the day care parking lot. There were people that were out at the ride-share as bullets were passing over their head. I have many that won’t speak about vaccines now and removed their names off of the papers. They don’t wish to present publicly anymore because they feel they were personally targeted because of misinformation.”

‘Did we do something wrong?’

HELP Committee Chairman Bill Cassidy, R-La., said at the beginning of the hearing he intended to invite Kennedy and possibly other HHS officials to testify before his committee later in the year if they wanted to respond to what was said in the Wednesday hearing. 

He also raised concerns that Monarez was fired after less than a month in the role, despite her being nominated by Trump, confirmed by the Senate and Kennedy saying while swearing her in that she had “unimpeachable scientific credentials.”

“We as senators need to ask ourselves, did we look past something? Did we do something wrong?” Cassidy said. “It may be that we did nothing wrong, in which case, Dr. Monarez and Dr. Houry, the onus is upon you to prove that the criticisms leveled by the secretary are not true.”

Louisiana Republican Sen. Bill Cassidy, chairman of the Health, Education, Labor and Pensions Committee, speaks with reporters  after holding a hearing with former Centers for Disease Control and Prevention Director Susan Monarez on Wednesday, Sept. 17, 2025. (Photo by Jennifer Shutt/States Newsroom)
Louisiana Republican Sen. Bill Cassidy, chairman of the Health, Education, Labor and Pensions Committee, speaks with reporters  after holding a hearing with former Centers for Disease Control and Prevention Director Susan Monarez on Wednesday, Sept. 17, 2025. (Photo by Jennifer Shutt/States Newsroom)

Cassidy later added that “it may be impossible to learn who’s telling the truth.”

Vermont independent Sen. Bernie Sanders, ranking member on the committee, said the Trump administration’s decision to fire Monarez after less than a month in the CDC director’s role was because “she refused to act as a rubber stamp to implement Secretary Kennedy’s dangerous agenda to substantially limit the use of safe and effective vaccines that would endanger the lives of the American people and people throughout the world.”

Sanders raised concerns that the loss of career officials at the CDC and other federal health agencies could hamper the country from addressing disease outbreaks in the months and years ahead. 

Confusion over whether Monarez was recorded

There were a few awkward moments in the hearing, in addition to the serious discussion about the Trump administration’s approach to public health. 

One came after Florida Republican Sen. Ashley Moody mentioned twice during her five minutes of questions that Monarez had spoken with Cassidy about her firing, implying that was somehow improper.  

Cassidy gave a lengthy statement afterward, clarifying the record. 

“As chairman of the committee with jurisdiction over the CDC that favorably reported Dr. Monarez as the CDC director, it is entirely appropriate for someone with oversight concerns to contact my office, or me, or frankly any of us,” Cassidy said. “Upon receiving outreach from Dr. Monarez, I contacted both the secretary and the White House to inquire about what was happening and to express concerns about what was alleged. As soon as the director was fired, the HELP Committee began reviewing the situation, as it is our responsibility, and any and all communication with the witnesses was conducted by HELP staff in coordination with attorneys.”

Another somewhat uncomfortable and slightly confusing moment came after Oklahoma Republican Sen. Markwayne Mullin told Monarez that someone had recorded her meeting or meetings with Kennedy.

Mullin then repeatedly questioned her recollection of her conversations with Kennedy, implying that he had a different view because he had listened to the recording. 

The exchange led Cassidy to give another statement to the committee. He appeared somewhat frustrated that someone gave just one senator on the panel the recording, that Mullin had not shared it with any other members of the committee and that HHS had chosen not to give it to the committee in response to a request for documents related to Monarez’s firing. 

“If a recording does not exist, I ask Sen. Mullin to retract his line of questions,” Cassidy said. “I’ll also note that if he has it, I’m also curious why only one senator was given this and why we’re just hearing about it now.”

A few minutes later, Cassidy announced to the hearing room that Mullin told reporters elsewhere that he was mistaken about there being a recording of the meeting or meetings. 

Monarez lawyer

Several GOP senators on the panel also questioned Monarez at length about when and why she chose to hire legal representation and why she ultimately went with Mark Zaid, who has made public statements against Trump and his policies. 

Monarez testified that she wasn’t aware of Zaid’s political beliefs when she hired him and hasn’t spoken with him about politics. 

“I was seeking some critical counsel to be able to help me make sure that I was understanding and aware of everything that had transpired and preparing for what might be next, including this committee hearing,” Monarez said. “Mark and I have never spoken about politics. I never asked him about his politics. He has never asked me about my politics.”

RFK Jr. battles with members of US Senate panel over vaccines, removal of CDC director

Health and Human Services Secretary Robert F. Kennedy Jr. appears before the Senate Finance Committee at the Dirksen Senate Office Building on Sept. 4, 2025 in Washington, D.C. (Photo by Andrew Harnik/Getty Images)

Health and Human Services Secretary Robert F. Kennedy Jr. appears before the Senate Finance Committee at the Dirksen Senate Office Building on Sept. 4, 2025 in Washington, D.C. (Photo by Andrew Harnik/Getty Images)

WASHINGTON — Health and Human Services Secretary Robert F. Kennedy Jr.  vehemently defended his actions on vaccines and other public health issues under questioning by both Republican and Democratic senators during a contentious hearing Thursday.

Kennedy, confirmed on a mostly party-line vote earlier this year, repeatedly justified firing everyone on an influential vaccine advisory panel, as well as the president’s decision to remove a Centers for Disease Control and Prevention director who’d served for less than a month after confirmation by the Senate.

“In your confirmation hearings, you promised to uphold the highest standards for vaccines. Since then, I’ve grown deeply concerned,” said Senate Majority Whip John Barrasso, R-Wyo. “The public has seen measles outbreaks. Leadership of the National Institutes of Health questioning the use of mRNA vaccines. The recently confirmed director of the Centers for Disease Control and Prevention fired. Americans don’t know who to rely on.”

Video courtesy of C-SPAN.

Barrasso, an orthopedic surgeon, sought to reinforce support for vaccines to Kennedy during the Senate Finance Committee hearing, saying they “are estimated to have saved 154 million lives worldwide.”

Louisiana Republican Sen. Bill Cassidy, a physician who received several concessions from Kennedy in exchange for voting to confirm him as HHS secretary, raised numerous questions about Kennedy’s behavior. Cassidy is the chairman of the Health, Education, Labor and Pensions Committee.

Cassidy appeared to box in Kennedy on the COVID-19 vaccine by saying President Donald Trump should receive the Nobel Prize for Operation Warp Speed, which led to the development of the shot during his first term. 

Kennedy agreed Trump should “absolutely” get the prize, leading Cassidy to question why he’d taken actions as HHS secretary to erode trust and eliminate funding for vaccine development activities. 

“It surprises me that you think so highly of Operation Warp Speed when, as an attorney, you attempted to restrict access,” Cassidy said. “It also surprises me because you’ve canceled, or HHS did, but apparently under your direction, $500 million in contracts using the mRNA vaccine platform that was critical to Operation Warp Speed.”

Cassidy said the cancellation represents not only “an incredible waste of money but it also seems like a commentary upon what the president did in Operation Warp Speed, which is to create a platform by which to create vaccines.”

Cassidy also questioned Kennedy’s actions eliminating everyone on the CDC’s Advisory Committee on Immunization Practices and replacing them with his own choices. 

“If we put people who are paid witnesses for people suing vaccines, that actually seems like a conflict of interest,” Cassidy said. 

Kennedy disagreed, testifying that “it may be a bias. And that bias, if disclosed, is okay.”

Tillis asks RFK Jr. to respond in writing

North Carolina Republican Sen. Thom Tillis asked Kennedy a series of questions but said he wanted the secretary to submit his answers in writing in order to clarify several of his positions. 

“Some of your statements seem to contradict what you said in the prior hearing,” Tillis said. “You said you’re going to empower the scientists at HHS to do their job. I’d just like to see evidence where you’ve done that, and I’m sure that you will have some.”

Tillis said he wanted Kennedy to respond to reports that he’s gone back on his commitments to senators to not do anything “that makes it difficult or discourages people from taking vaccines” and that Kennedy would not “impose my belief over any of yours.”

“That, again, seems to be contradictory to the firing of the CDC director, the canceling of mRNA research contracts, firing advisory board members, attempting to stall NIH funding, eliminating funding for I think a half a billion dollars for further mRNA research,” he said, referring to the National Institutes of Health. 

Tillis said he was having difficulty understanding why former CDC Director Susan Monarez, whom Trump nominated in March and the Senate voted to confirm in late July, had been fired so quickly. 

“I don’t see how you go … from a public health expert with unimpeachable scientific credentials, a long-time champion of MAHA values, caring and compassionate and brilliant microbiologist — and four weeks later, fire her,” Tillis said. 

CDC shooting, Monarez firing probed

Georgia Democratic Sen. Raphael Warnock questioned Kennedy at length over the firing of Monarez as well as a shooting at the Atlanta-based agency this summer. 

Kennedy testified that he doesn’t believe he criticized Monarez during a meeting in late August over her comments following the CDC shooting that “misinformation can be dangerous.”

During that meeting, Kennedy said he did demand that Monarez fire career CDC scientists but testified he didn’t tell her to accept the recommendations of the vaccine advisory panel without further review.

“What I asked her about is, she had made a statement that she was going to not sign on and I wanted clarification about that,” Kennedy said. “I told her I didn’t want her to have a role if she’s not going to sign onto it.”

Monarez wrote in an op-ed published in the Wall Street Journal just hours before the hearing began that during the meeting with Kennedy she “was told to preapprove the recommendations of a vaccine advisory panel newly filled with people who have publicly expressed antivaccine rhetoric.”

“That panel’s next meeting is scheduled for Sept. 18-19,” Monarez wrote. “It is imperative that the panel’s recommendations aren’t rubber-stamped but instead are rigorously and scientifically reviewed before being accepted or rejected.”

Warnock asked Kennedy if he said that the CDC was the “most corrupt federal agency in the history of the world.” 

Kennedy testified he didn’t say that exactly but did say “it’s the most corrupt agency at HHS and maybe the government.” 

Warnock concluded his five minutes of questions telling Kennedy that “it’s clear you’re carrying out your extremist beliefs” and that he represents “a threat to the public health of the American people.”

“For the first time, we’re seeing deaths from children from measles,” Warnock said. “We haven’t seen that in two decades. We’re seeing that under your watch. You are a hazard to the health of the American people.”

Lankford, Daines ask about medication abortion

Several senators, including Oklahoma Republican James Lankford and Montana Republican Steve Daines, asked Kennedy about the ongoing review of mifepristone, one of two prescription pharmaceuticals used in medication abortion. 

Kennedy said he spoke with FDA Commissioner Marty Makary about the topic just yesterday and committed to keeping senators informed, but didn’t appear to know much more than that. 

“I don’t know if they’re going to do an insurance claim study. That’s one way to do it. I don’t know exactly whether they’re doing epidemiological studies or observational studies. I don’t know exactly what they’re doing,” Kennedy said. “But I know I talked to Marty Makary about it yesterday, and he said those studies are progressing and that they’re ongoing. So I will keep your office informed at every stage.”

Kennedy testified that he didn’t know when exactly the studies would be completed. 

The FDA first approved mifepristone in 2000 before updating the prescribing guidelines in 2016 and during the coronavirus pandemic. 

It’s currently approved for up to 10 weeks gestation and can be prescribed via telehealth and shipped to patients. Mifepristone is the first pharmaceutical of medication abortion and is typically followed by misoprostol. 

Medication abortion accounted for about 64% of all abortions in 2023, according to research from the Guttmacher Institute. 

The Supreme Court rejected an effort to limit access to medication abortion last year in a case originally filed by four anti-abortion medical organizations and four anti-abortion doctors that were represented by Alliance Defending Freedom.

Justice Brett Kavanaugh wrote the opinion that “federal conscience laws have protected pro-life doctors ever since FDA approved mifepristone in 2000.”

Numerous medical organizations, including the American College of Obstetricians and Gynecologists and the American Medical Association, wrote briefs to the Supreme Court in that case attesting to the safety and efficacy of mifepristone. 

“The scientific evidence is overwhelming: major adverse events occur in less than 0.32% of patients,” the medical organizations wrote. “The risk of death is almost non-existent.”

At CDC, worries mount that agency has taken anti-science turn

Health and Human Services Secretary Robert F. Kennedy Jr. speaks alongside President Donald Trump at a news conference on May 12. (Andrew Harnik/Getty Images)

Public health and access to lifesaving vaccines are on the line in a high-stakes leadership battle at the Centers for Disease Control and Prevention.

Health and Human Services Secretary Robert F. Kennedy Jr.’s push to fire CDC director Susan Monarez is more than an administrative shake-up. The firing marks a major offensive by Kennedy to seize control of the agency and impose an anti-vaccine, anti-science agenda that will have profound effects on the lives and health of all Americans, public health leaders say.

Kennedy wants to see the Pfizer and Moderna messenger RNA-based covid-19 vaccines pulled from the market, according to two people familiar with the planning who asked not to be identified because they’re not authorized to speak to the press. He’s also set his sights on restricting or halting access to some pediatric immunizations, some public health leaders say.

His actions have already reduced federal help to states, creating the potential for more infectious disease outbreaks and incidences of foodborne illness. Some public health leaders say they expect Kennedy will use the CDC to publicize health information that isn’t grounded in science.

“It’s crazy season,” said Richard Besser, former acting CDC director during the Obama administration. “People want information they can trust to make critical decisions about their health. Until now, we’ve been able to say look at the CDC. Unfortunately, we’re not able to do that anymore.”

HHS spokesperson Emily Hilliard disputed the criticism.

“Secretary Kennedy remains firmly committed to delivering on President Trump’s promise to Make America Healthy Again, dismantling the failed status quo that fueled a nationwide chronic disease epidemic and eroded public trust in our public health institutions,” Hilliard said in a statement.

White House spokesperson Kush Desai said Kennedy and Commissioner of Food and Drugs Marty Makary have reiterated that covid shots will remain available for Americans who need and want them.

“The Trump administration is restoring Gold Standard Science as the sole guiding principle of health decision-making,” Desai said in an email. “Only the Fake News could ignore these facts to continue pushing Democrat talking points and hysteria.”

Behind the ouster

The shake-up began last week, when Kennedy sought to fire Monarez, a microbiologist who’d just been confirmed by the Senate in July. She refused to leave the position, and her lawyers said Kennedy sought to oust her because she wouldn’t fire senior staff or follow unscientific directives. Four top career officials at the CDC resigned on Aug. 27 in protest.

Career staffers at the CDC and some public health groups had hoped President Donald Trump would intervene and put the brakes on Kennedy. Instead, the White House backed Kennedy, saying Monarez was fired.

Trump on Sept. 1 demanded that drug companies show that covid vaccines work, in a further sign he’s not set on defending the shots.

“I hope OPERATION WARP SPEED was as ‘BRILLIANT’ as many say it was. If not, we all want to know about it, and why???” Trump said on Truth Social.

Operation Warp Speed was the initiative that Trump himself announced in 2020 to accelerate the development of covid vaccines, including the Pfizer and Moderna shots. The vaccines have proved safe and effective in multiple clinical trials; a study published in JAMA Health Forum estimated that they saved about 2.5 million lives worldwide.

CDC staffers are worried the agency’s next director won’t fight for science, according to an employee who asked not to be identified for fear of professional retaliation.

Trump’s support for Monarez’s ouster was a watershed moment that signaled there are no checks on Kennedy and his agenda, public health advocates say. Leading congressional Democrats such as Senate Minority Leader Chuck Schumer called for Kennedy’s firing. Hundreds of HHS staffers have also implored Congress to intervene, saying Kennedy threatens science and public health. He is slated to testify Sept. 4 before the Senate Finance Committee.

Kennedy said in a message to CDC staff that his focus is on boosting the agency’s reputation and leadership. The Atlanta-based agency was already reeling after the Trump administration pushed out thousands of its staff and a gunman who reportedly believed the covid vaccine had caused him health problems fired hundreds of rounds at its campus last month, killing a police officer.

“The CDC must once again be the world’s leader in communicable disease prevention. Together, we will restore trust,” Kennedy wrote. “Together, we will rebuild this institution into what it was always meant to be: a guardian of America’s health and security.” He said his deputy, Jim O’Neill, would serve as acting CDC director.

Nine former CDC directors or acting directors who served under both Republicans and Democrats criticized Kennedy in the aftermath of the Monarez firing, saying in an op-ed in The New York Times that the impact on public health is “unacceptable, and it should alarm every American, regardless of political leanings.”

HHS spokesperson Hilliard took exception with this point, listing four covid vaccines that continue to get the nod for use.

However, the Food and Drug Administration last

week approved updated covid mRNA boosters only for people 65 or older and others at high risk of complications. The CDC has also stopped recommending the shots for healthy children and pregnant women. Previously, the shots had been advised for anyone 6 months or older.

As a result, many people who don’t meet the criteria but want the vaccine will have to get prescriptions or consult with their doctors. Insurance may not always cover the shots, which can run around $200. Major drugstores such as Walgreens and CVS have said the shots may not be available at all pharmacies and may require a prescription.

The American Academy of Pediatrics on Aug. 19 broke with the administration, recommending that all young children get the covid vaccine. Insurance still may not cover the cost in some cases and parents could face obstacles in getting the vaccines without a prescription.

Next move: The advisory committee

Kennedy and his team changed official covid vaccine recommendations even though there have been no new safety issues. A dose of the 2023-24 covid mRNA vaccine prevented significant illness and death across all age groups, according to a study published in August led by a University of Michigan researcher. The virus killed about 1,000 people a week in the U.S. in mid-January, and cases are rising again and expected to accelerate this winter.

Kennedy has handpicked a vaccine advisory committee for the CDC that is reviewing mRNA-based covid vaccines, which he falsely claimed in 2021 were “the deadliest vaccine ever made.” The covid vaccine review is being led by Retsef Levi, a professor of operations management at the Massachusetts Institute of Technology who has said without evidence that the shots cause serious harm, including death. If the committee recommends against them, Kennedy and the FDA could then begin the process of removing them from the market.

Taking mRNA-based covid shots off the market would leave consumers with fewer options for protection. Paxlovid, an antiviral medication that treats the infection in high-risk adults, would be available.

The CDC advisory committee reviewing the covid shots is also probing a long-debunked link between aluminum, used in many childhood immunizations such as those for hepatitis A and pneumonia, and autism or allergies.

The group’s findings are expected to support the erroneous link, some public health officials say. HHS could then require drugmakers to undertake costly reformulations of the shots or stop manufacturing them altogether.

“That would set up the elimination of all childhood vaccines,” Besser said.

The advisory group’s next meeting is set for Sept. 18, although Sen. Bill Cassidy (R-La.) has called for the meeting to be indefinitely delayed. Cassidy, a physician who chairs the Senate Health, Education, Labor and Pensions Committee, voted for Kennedy’s confirmation as HHS secretary after receiving assurances, he said, that the longtime vaccine opponent wouldn’t disrupt the U.S. vaccination system. Kennedy’s promises, Cassidy said, included that he wouldn’t change the CDC’s Advisory Committee on Immunization Practices.

Kennedy removed all of the panel’s members in June and replaced them with his own appointees, including anti-vaccine activists.

Kennedy’s move to put his stamp on the CDC means states that have long relied on the agency’s expertise and help in crises such as disease outbreaks will largely be left to fend for themselves, said Ashish Jha, who served as President Joe Biden’s covid response coordinator from 2022 to 2023.

“States are going to be left on their own,” Jha said. “States will struggle with the CDC incapable and dysfunctional. Our system is not designed for states to go it alone.”

The CDC typically plays a critical role by assisting states with disease surveillance, public health interventions, and outbreak response, especially when a crisis spills across state lines. An outbreak of measles this year led to more than 1,400 cases nationwide, and states including Texas, where the outbreak was identified, struggled to get help from the CDC.

A CDC program that has long tracked pathogens in food has already reduced the number of hazards it looks for from eight to two, which public health leaders say is making it harder to identify outbreaks. Staff overseeing a CDC program that tracks outdoor pollution that can exacerbate asthma also have been cut.

The agency runs a hotline that doctors around the country can call to get treatment and other types of advice. Under Kennedy’s watch, the CDC has had to pare assistance because of staffing reductions, said Wendy Armstrong, vice president at the Infectious Diseases Society of America.

“Lives are 100% at stake, no question about it,” Armstrong said. “That you can no longer trust the recommendations out of the CDC is just devastating. It’s appalling to think we can’t trust that information is science-based anymore.”

Kennedy wants to shake up CDC leadership because he sees the agency as the heart of corruption and resistance within the federal health bureaucracy, according to people familiar with his planning. Kennedy has said the agency suffers from malaise and bias.

Many public health leaders, however, view the CDC as under siege by an administration they say is corrupting science for its own ends. HHS staffers signed onto a letter that now has more than 6,800 signatures, saying Kennedy is “endangering the nation’s health by repeatedly spreading inaccurate health information.”

Kennedy has also been fending off mounting criticism of his response to the shooting at the CDC’s headquarters. He responded to the attack on social media, hours later, after first posting pictures of himself fly-fishing.

Some younger staffers are considering leaving and some workers feel like the shooting accelerated Kennedy’s overhaul of the agency, the CDC employee said.

With the battle for control of the CDC still raging, public health leaders are now looking to Congress to put the brakes on Kennedy. Some Republican lawmakers have called for a review of Kennedy’s actions.

“These high profile departures will require oversight by the HELP Committee,” Cassidy said Aug. 27 on the social platform X. Cassidy had backed Monarez to lead the agency.

Renuka Rayasam, KFF Health News senior correspondent, and Andy Miller contributed to this article.

KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the core operating programs at KFF—an independent source of health policy research, polling, and journalism. Learn more about KFF.

Subscribe to KFF Health News’ free Morning Briefing.

This article first appeared on KFF Health News and is republished here under a Creative Commons Attribution-NoDerivatives 4.0 International License.

CDC vaccine officials resign while childhood vaccination rates decline

A child gets an MMR vaccine at a clinic put on by Lubbock Public Health Department in Lubbock, Texas, in March. States have been reporting steady increases in vaccination exemption requests for kids. (Photo by Jan Sonnenmair/Getty Images)

Dr. Rana Alissa hears it daily in the clinic.

“It’s better for my kid to get the virus than get the vaccine.”

“The more you [doctors] vaccinate, the more money you get.”

“I did not vaccinate any of my kids, and I’m not going to vaccinate this one. So, please, don’t waste your time.”

The Jacksonville, Florida, pediatrician said on average, she’d hear vaccine skepticism from a couple of parents a month, at most, before the COVID-19 pandemic. “Now, it’s every day,” said Alissa, who is also president of the Florida Chapter of the American Academy of Pediatrics.

Medical experts say hesitancy is likely to increase further as a result of misinformation pouring from the Trump administration — and turmoil at the federal agency largely responsible for setting vaccine policy.

On Thursday, three top officials were escorted out of the Atlanta headquarters of the federal Centers for Disease Control and Prevention.

All three officials resigned to protest the effort by Secretary of Health and Human Services Robert F. Kennedy Jr. to dismiss CDC Director Susan Monarez for pushing back against Kennedy’s vaccine policies.

One of the officials, Dr. Demetre Daskalakis, director of the CDC’s National Center for Immunization and Respiratory Diseases, posted on X that he’s resigning because “the intentional eroding of trust in low-risk vaccines” will cause the nation to suffer.

Earlier this week, the U.S. Food and Drug Administration restricted access to updated COVID-19 shots. The new rules include limitations for young children that the American Academy of Pediatrics called “deeply troubling.” The FDA only approved COVID-19 vaccines for people who are 65 and older and those who are known to be at risk for a severe case. Consultation with a medical provider will be required before the shot is given to healthy children under 18, meaning parents can’t simply take their kids to a vaccination clinic or pharmacy.

In June, Kennedy ousted all 17 members of the vaccine advisory committee at the CDC, replacing them with some members who are vaccine skeptics. Many states use the committee’s recommendations to develop their vaccine requirements. And in May, Kennedy rescinded recommendations for kids to get vaccinated against COVID-19.

In his books, experts say, Kennedy appears to promote his own version of miasma theory, an obsolete belief dating back to ancient times that diseases are caused by vapors from rotting organic matter. Scientists have since proven that microbes, not bad air, cause infectious diseases.

Experts say Kennedy’s actions are likely to make vaccination rates worse, paving the way for more outbreaks.

“Every vaccine that we give prevents a serious and life-threatening disease,” New York pediatrician Dr. Jesse Hackell, chair of the Committee on Pediatric Workforce at the American Academy of Pediatrics, told Stateline. “I don’t want to force anybody, but I do want to make sure that the information they’re getting is quality information — and that’s not what is coming from HHS.”

Nonmedical exemptions

Every state requires kids to get certain shots to attend school. All states exempt children who can’t be immunized for medical reasons, but nonmedical exemptions for religious or personal reasons vary from state to state.

Vaccination rates among kids are declining. Flu vaccinations, for example, hit their lowest rate since 2019. And since the beginning of the pandemic, exemption requests have increased across the country.

Among kindergarteners, nonmedical exemptions have increased each year since 2020, from 1.9% in the first year of the pandemic to 3.4% in the 2024-25 school year, according to the latest data from the federal Centers for Disease Control and Prevention. Exemptions increased in 36 states and Washington, D.C. Seventeen states reported exemption rates over 5%.

The changes may seem small. But experts say even slight increases in exemptions and decreases in vaccinations make a big difference.

“With a disease that’s as infectious as measles … small increases in vaccination rates could really go a long way,” epidemiologist Sophia Newcomer, a University of Montana associate professor, said in a recent panel discussion hosted by Montana Families for Vaccines.

Alissa and other experts say rampant confusion around the shots, including federal officials casting doubt, is exacerbating the problem. Often, parents aren’t sure whom they can trust, finding conflicting information and unreliable sources, she said.

“[Parents] come to our clinic and the hospitals and they say, ‘We looked it up, and we just don’t want it,’” she said. “There’s different kinds of reasoning: the ingredients of the vaccine, the side effects of the vaccine, ‘vaccines don’t work.’”

But research consistently shows vaccines protect children from serious illness. Shots also protect the most vulnerable who can’t get vaccinated, such as babies who are too young, or children and adults who are immunocompromised. Babies up to age 2 are more likely to get very sick from COVID-19, making up the most hospitalizations among kids.

Ultimately, Alissa said, “We are endangering each other.”

In Florida, where Alissa practices, religious exemptions have increased monthly, according to a state report that tracked the numbers through April. Some counties have higher rates of children with religious exemptions than others, ranging from about 1.5% to 15%, the state department of health reported. Among kindergarteners in the state, the rate of nonmedical exemptions rose from 2.7% in the 2020-21 school year to 4.8% in the 2024-25 school year, CDC data shows.

We are endangering each other.

– Dr. Rana Alissa, Jacksonville, Fla., pediatrician and president of the Florida Chapter of the American Academy of Pediatrics

Five states — California, Connecticut, Maine, New York and West Virginia — don’t allow nonmedical exemptions, according to the National Conference of State Legislatures. Two West Virginia families with immunocompromised kids brought lawsuits over Republican Gov. Patrick Morrisey’s January executive order mandating religious exemptions despite state law.

Kennedy defended religious exemptions and endorsed the governor’s order in a post on X. His agency also sent letters to West Virginia health departments warning of civil rights violations if they don’t allow such exemptions.

“There’s a ton of variability across states in how easy it is to not get vaccinated,” Newcomer, of the University of Montana, said. Some states require parental vaccine education as part of the exemption request while others don’t.

“Increased exemptions needs to be fought at every level — working to make sure there’s access, to make sure that there’s good information, and to make sure that there’s strong policy at the state level, so that people aren’t exploiting exemption loopholes,” Northe Saunders, American Families for Vaccines president, said during the panel discussion.

Other vaccines

Doctors are worried that other vaccines will be targeted by the Trump administration, such as those for whooping cough. By April, preliminary CDC data showed more than 9,000 cases this year, about twice as many compared with the same time last year and more than there were right before the pandemic. Whooping cough, or pertussis, can be deadly for babies. Vaccines help prevent severe whooping cough illness.

Hackell said that when he was training in the 1970s, there were no pneumococcal and haemophilus vaccines. Babies would come in with 104-degree fevers and they were immediately tested for the infections, he recalled. For babies under age 2, those bacterial infections can show up as only a high fever, but the infection can rapidly turn fatal without treatment, he told Stateline.

“When I trained, we didn’t have these vaccines, and these kids kept us up at night,” Hackell said. “I never want to practice in those days. I never want to go back to that. … To me, that is unacceptable to submit my patients to those risks that we’ve been able to reduce.”

This week the FDA removed one of the available COVID-19 vaccines for young children, limiting the Spikevax vaccine to only kids with at least one serious health issue. Moderna’s shot is still available for children 6 months and older. Pfizer’s shot is no longer available for kids under 5, as the FDA is ending its emergency use authorization for the age group.

But the American Academy of Pediatrics recommends COVID-19 shots for children 6 months to 2 years. It also recommends them for older children with underlying health issues. Healthy children whose parents want them to get the shot should also be offered them, the AAP says.

Hackell is concerned by the FDA’s new limitations on the shot.

“As a parent, as a grandparent and as a physician who takes care of vulnerable kids, it disgusts me,” Hackell said.

He’s also concerned about vulnerable kids who get their shots through the federal Vaccines for Children (VFC) Program, which covers shots if parents can’t afford them and follows federal vaccine advisory recommendations.

“If you’re covered by VFC, which is basically kids on Medicaid and a few other populations, then you’re out of luck,” Hackell said. “To me, that’s a huge inequity in access to care, which is indefensible.”

He added that the move breaks with the administration’s emphasis on individual decision-making, saying the new restrictions limit parental decisions.

‘Normalization’ of outbreaks

During the Montana panel discussion, Dr. Paul Offit, director of the Vaccine Education Center at Children’s Hospital of Philadelphia, pointed to CDC data showing that over the past year alone, about 1 in 5 children and adolescents hospitalized with COVID-19 were put in the ICU. And between September 2023 and last August, 152 children died of COVID-19 and 213 children died of the flu.

While Texas officially declared its measles outbreak over — which means the state hasn’t reported a new case in six weeks — neighboring New Mexico continues to see new cases.

“What we’re going to see is, you know, sadly, a normalization of these outbreaks,” said Rekha Lakshmanan, chief strategy officer at The Immunization Partnership, a Texas-based vaccine education organization. “We need to make sure that kids are protected against the diseases that they can be protected against, because we truly are in a vulnerable state right now.”

Newcomer, the Montana epidemiologist, said that under-vaccination trends are usually due to disparities in access, such as challenges in reaching vaccine providers in rural communities. At rural health care centers lacking staff and technology, it’s harder to automate vaccination reminders for patients — which can increase the likelihood patients show up for appointments but require technical infrastructure, she explained.

Adding misinformation to the mix only makes matters worse, experts say.

“Parents are confused and understandably concerned,” Offit told Stateline. “It’s the most vulnerable among us that will suffer, and that will be our children.”

He added that he’s also wary about the federal administration’s removal of data, concerned that vaccination figures will be next.

“It’s nightmarish,” he said. “What worries me the most is we’re not going to know the degree that we’re suffering. We’re not, because the CDC is losing its capacity to do adequate surveillance across the country.”

Stateline reporter Nada Hassanein can be reached at nhassanein@stateline.org.

Stateline is part of States Newsroom, a nonprofit news network supported by grants and a coalition of donors as a 501c(3) public charity. Stateline maintains editorial independence. Contact Editor Scott S. Greenberger for questions: info@stateline.org.

US Senate health committee leaders question CDC tumult

U.S. Senate Health, Education, Labor and Pensions Chairman Bill Cassidy speaks with Health and Human Services Secretary Robert F. Kennedy Jr. after Kennedy's confirmation hearing on Jan. 30, 2025. (Photo by Kevin Dietsch/Getty Images)

U.S. Senate Health, Education, Labor and Pensions Chairman Bill Cassidy speaks with Health and Human Services Secretary Robert F. Kennedy Jr. after Kennedy's confirmation hearing on Jan. 30, 2025. (Photo by Kevin Dietsch/Getty Images)

WASHINGTON — Bipartisan leaders of a U.S. Senate committee dealing with health policy expressed alarm with the direction of the country’s top public health agencies after President Donald Trump fired the director of the Centers for Disease Control and Prevention and other high-level officials resigned. 

Louisiana Republican Sen. Bill Cassidy — chairman of the Health, Education, Labor and Pensions Committee — posted on social media late Wednesday that the “high profile departures will require oversight by the HELP Committee.”

Cassidy separately called on the Advisory Committee on Immunization Practices to indefinitely postpone its September meeting.

“Serious allegations have been made about the meeting agenda, membership, and lack of scientific process being followed for the now announced September ACIP meeting,” Cassidy wrote in a statement. “These decisions directly impact children’s health and the meeting should not occur until significant oversight has been conducted. If the meeting proceeds, any recommendations made should be rejected as lacking legitimacy given the seriousness of the allegations and the current turmoil in CDC leadership.”

Vermont independent Sen. Bernie Sanders, ranking member on the committee, called for a bipartisan investigation into the reasons Trump fired Susan Monarez as CDC director less than a month after she received Senate confirmation.

Sanders said that Health and Human Services Director Robert F. Kennedy Jr., Monarez and the handful of high-ranking CDC officials who resigned this week should be able to testify publicly about what’s happening inside the agency. 

“We need leaders at the CDC and HHS who are committed to improving public health and have the courage to stand up for science, not officials who have a history of spreading bogus conspiracy theories and disinformation,” Sanders wrote.

White House Press Secretary Karoline Leavitt speaks during the daily press briefing in the Brady Press Briefing Room at the White House on March 26, 2025 in Washington, DC. Leavitt addressed President Trump’s plans for future tariffs on the auto industry and reports about top Trump aides mistakenly including the editor-in-chief for The Atlantic magazine on a high level administration Signal group chat discussing military plans. (Photo by Win McNamee/Getty Images)
White House press secretary Karoline Leavitt briefs reporters on March 26, 2025. (Photo by Win McNamee/Getty Images)

White House press secretary Karoline Leavitt said during a briefing that Trump had every right to fire Monarez and that he expects to pick a new nominee “very soon.”

“Her lawyers’ statement made it abundantly clear themselves that she was not aligned with the president’s mission to make America healthy again,” Leavitt said. “The secretary asked her to resign. She said she would and then she said she wouldn’t. So the president fired her, which he has every right to do.” 

Kennedy is scheduled to testify before the Senate Finance Committee next week, that panel’s chairman, Idaho Republican Mike Crapo, announced Thursday.

Kennedy “has placed addressing the underlying causes of chronic diseases at the forefront of this Administration’s health care agenda,” Crapo wrote on X. “I look forward to learning more about @HHSGov’s Make America Healthy Again actions to date and plans moving forward.”

Cassidy key vote for RFK

Cassidy was an essential vote to confirm Kennedy as director of HHS, which oversees the CDC, though he expressed concerns throughout that process that Kennedy’s past statements about vaccines weren’t rooted in reputable medical research.

Cassidy said during a floor speech in February after voting to advance Kennedy’s nomination that Kennedy assured him he will protect “the public health benefit of vaccination.” 

“If Mr. Kennedy is confirmed, I will use my authority of the Senate committee with oversight of HHS to rebuff any attempt to remove the public’s access to life-saving vaccines without ironclad causational scientific evidence that can be accepted and defended before the mainstream scientific community and before Congress,” Cassidy said at the time. “I will watch carefully for any effort to wrongly sow public fear about vaccines between confusing references of coincidence and anecdote.”

Trump administration says CDC chief ousted, but her lawyer says she hasn’t resigned or been fired

Susan Monarez, director of the Centers for Disease Control and Prevention, testifies during her confirmation hearing before the Senate Committee on Health, Education, Labor, and Pensions in the Dirksen Senate Office Building on June 25, 2025 in Washington, D.C.. (Photo by Kayla Bartkowski/Getty Images)

Susan Monarez, director of the Centers for Disease Control and Prevention, testifies during her confirmation hearing before the Senate Committee on Health, Education, Labor, and Pensions in the Dirksen Senate Office Building on June 25, 2025 in Washington, D.C.. (Photo by Kayla Bartkowski/Getty Images)

WASHINGTON — The director of the Centers for Disease Control and Prevention doesn’t appear inclined to leave her post, despite the Trump administration announcing Wednesday that she’s no longer running one of the country’s top public health agencies. 

Attorneys for Susan Monarez, who received Senate confirmation in late July, posted that she hasn’t been fired or resigned, but didn’t announce whether they plan to sue the administration. 

“When CDC Director Susan Monarez refused to rubber-stamp unscientific, reckless directives and fire dedicated health experts she chose protecting the public over serving a political agenda,” wrote Mark S. Zaid and Abbe David Lowell. “For that, she has been targeted. Dr. Monarez has neither resigned nor received notification from the White House that she has been fired, and as a person of integrity and devoted to science, she will not resign.”

The statement from Monarez’s attorneys came just hours after the Department of Health and Human Services, which oversees the CDC, wrote on social media that she was no longer running the agency. 

“Susan Monarez is no longer director of the Centers for Disease Control and Prevention,” the post stated. “We thank her for her dedicated service to the American people. @SecKennedy has full confidence in his team at@CDCgov who will continue to be vigilant in protecting Americans against infectious diseases at home and abroad.”

The Washington Post first reported the news. 

The U.S. Senate voted along party lines to confirm Monarez as CDC director in late July, giving her just weeks in one of the nation’s top public health roles.

Monarez’s last post on social media from her official account was on Aug. 22, marking the death of a police officer after a gunman opened fire at the CDC’s headquarters in Atlanta. 

“A large group of CDC employees and I attended today’s memorial for Officer David Rose, whose Tour of Duty ended on August 8 when he responded to shots fired,” Monarez wrote. “He leaves behind a legacy of love, courage, and service to the community that will never be forgotten.”

The dispute over Monarez’s position as CDC director appeared to potentially mark the beginning of a wave of resignations from other public health officials, including Director of the National Center for Immunization and Respiratory Diseases Demetre C. Daskalakis.

“I am unable to serve in an environment that treats CDC as a tool to generate policies and materials that do not reflect scientific reality and are designed to hurt rather than to improve the public’s health,” Daskalakis wrote in a lengthy social media post. “The recent change in the adult and children’s immunization schedule threaten the lives of the youngest Americans and pregnant people.”

Monarez second choice after Weldon

Monarez was President Donald Trump’s second choice for CDC director. He originally selected former Florida U.S. Rep. Dave Weldon to run the CDC shortly after he secured election to the Oval Office in November. But the White House pulled Weldon’s nomination in March, after it appeared he couldn’t secure the votes needed for confirmation.

Later that month, Trump announced his plans to nominate Monarez in a social media post.

“Dr. Monarez brings decades of experience championing Innovation, Transparency, and strong Public Health Systems,” Trump wrote. “She has a Ph.D. from the University of Wisconsin, and PostDoctoral training in Microbiology and Immunology at Stanford University School of Medicine.

“As an incredible mother and dedicated public servant, Dr. Monarez understands the importance of protecting our children, our communities, and our future. Americans have lost confidence in the CDC due to political bias and disastrous mismanagement. Dr. Monarez will work closely with our GREAT Secretary of Health and Human Services, Robert Kennedy Jr. Together, they will prioritize Accountability, High Standards, and Disease Prevention to finally address the Chronic Disease Epidemic and, MAKE AMERICA HEALTHY AGAIN!”

Restoring trust in CDC

Monarez testified in front of the U.S. Senate Committee on Health, Education, Labor and Pensions in June as part of her confirmation process. The committee voted 12-11 in July to send her nomination to the Senate floor, where Republicans approved her to the post later that month. 

Chairman Bill Cassidy, R-La., said during the committee’s markup that he believed Monarez would put science first and help to restore public trust in the agency. 

“The United States needs a CDC director who makes decisions rooted in science, a leader who will reform the agency and work to restore public trust in health institutions,” Cassidy said at the time. “With decades of proven experience as a public health official, Dr. Monarez is ready to take on this challenge.”

US Senate confirms Trump pick to head Centers for Disease Control and Prevention

Susan Monarez, President Donald Trump’s nominee to be the director of the Centers for Disease Control and Prevention, testifies during her confirmation hearing before the Senate Committee on Health, Education, Labor, and Pensions on June 25, 2025. (Photo by Kayla Bartkowski/Getty Images)

Susan Monarez, President Donald Trump’s nominee to be the director of the Centers for Disease Control and Prevention, testifies during her confirmation hearing before the Senate Committee on Health, Education, Labor, and Pensions on June 25, 2025. (Photo by Kayla Bartkowski/Getty Images)

WASHINGTON — The U.S. Senate voted to confirm Susan Monarez as director of the Centers for Disease Control and Prevention on Tuesday.

Monarez — whom the Senate confirmed on a party-line vote, 51-47 — will now be responsible for the national public health agency within the Department of Health and Human Services. The Atlanta-based agency has faced backlash as HHS Secretary Robert F. Kennedy Jr. pursues a vaccine-skeptical agenda.

GOP Sens. Bill Hagerty of Tennessee and Dan Sullivan of Alaska did not vote.

Monarez was the acting director of the CDC between January and March. She previously served as the deputy director of the Advanced Research Projects Agency for Health, which is part of HHS.

Monarez, who has a Ph.D. in microbiology and immunology, will be the first person without a medical degree to hold the title since 1953.

The White House originally selected former Florida U.S. Rep. Dave Weldon to lead the CDC but withdrew the nomination in March.

Monarez’s confirmation followed a procedural vote earlier Tuesday that saw her advance, 52-47, along party lines.

Kennedy continues to face scrutiny after he fired all 17 members of the Advisory Committee on Immunization Practices, or ACIP, in June and named eight new members — a number of whom are viewed as skeptical of vaccines.

Vermont independent Sen. Bernie Sanders, ranking member of the Senate Committee on Health, Education, Labor and Pensions, launched an investigation alongside seven Democratic members of the committee Tuesday regarding Kennedy’s firings and replacements within the critical vaccine panel.

“By removing all 17 of ACIP’s members and replacing them with eight individuals handpicked to advance your anti-vaccine agenda, you have put decades of non-partisan, science-backed work — and, as a result, Americans’ lives — at risk,” the senators wrote in a letter to Kennedy.

Those seven Democratic committee members include Sens. John Hickenlooper of Colorado, Lisa Blunt Rochester of Delaware, Angela Alsobrooks of Maryland, Ed Markey of Massachusetts, Maggie Hassan of New Hampshire, Andy Kim of New Jersey and Tim Kaine of Virginia. 

US Senate panel approves Trump pick to head Centers for Disease Control and Prevention

Susan Monarez, President Donald Trump’s nominee to be the director of the Centers for Disease Control and Prevention, testifies during her confirmation hearing before the Senate Committee on Health, Education, Labor, and Pensions in the Dirksen Senate Office Building on June 25, 2025 in Washington, D.C. (Photo by Kayla Bartkowski/Getty Images)

Susan Monarez, President Donald Trump’s nominee to be the director of the Centers for Disease Control and Prevention, testifies during her confirmation hearing before the Senate Committee on Health, Education, Labor, and Pensions in the Dirksen Senate Office Building on June 25, 2025 in Washington, D.C. (Photo by Kayla Bartkowski/Getty Images)

WASHINGTON — President Donald Trump’s candidate to lead the Centers for Disease Control and Prevention advanced out of a Senate committee Wednesday following a party-line vote, moving her one step closer to confirmation.

Susan Monarez’s nomination now goes to the floor, where she will likely secure the backing needed to officially take on the role of CDC director after garnering support from Republicans across the political spectrum during the committee’s 12-11 vote.

Senate Majority Leader John Thune, R-S.D., will be in charge of scheduling that vote, though if it isn’t held during the next few weeks, Monarez will have to wait until after the chamber’s August recess.

Chairman Bill Cassidy, R-La., said during the Health, Education, Labor and Pensions Committee’s markup he believes Monarez is a strong candidate for CDC director and that he hopes she will help get the nation’s ongoing measles outbreak under control.

“The United States needs a CDC director who makes decisions rooted in science, a leader who will reform the agency and work to restore public trust in health institutions,” Cassidy said. “With decades of proven experience as a public health official, Dr. Monarez is ready to take on this challenge.”

Sanders criticizes Monarez on vaccine safety

Every Republican senator on the committee, including Maine’s Susan Collins and Alaska’s Lisa Murkowski, voted to advance Monarez’s nomination.

Vermont independent Sen. Bernie Sanders, ranking member on the panel, opposed Monarez’s advancement along with the Democrats on the committee.

Sanders argued that during Monarez’s time as acting director of the CDC, she didn’t do enough to counter Secretary of Health and Human Services Robert F. Kennedy Jr., especially on the safety of vaccines. 

“Today, the United States is reporting the highest number of measles cases in 33 years,” Sanders said. “In my view, we need a CDC director who will defend science, protect public health and repudiate Secretary Kennedy’s dangerous conspiracy theories about safe and effective vaccines that have saved, over the years, millions of lives.”

Second CDC choice from Trump

Monarez testified before the Health, Education, Labor and Pensions Committee in June, a standard part of the confirmation process.

Trump originally selected former Florida U.S. Rep. Dave Weldon to run the Atlanta-based CDC shortly after he secured election to the Oval Office in November. But the White House pulled Weldon’s nomination in March, after it appeared he couldn’t secure the votes needed for confirmation.

Later that month, Trump announced his plans to nominate Monarez in a social media post.

“Dr. Monarez brings decades of experience championing Innovation, Transparency, and strong Public Health Systems,” Trump wrote. “She has a Ph.D. from the University of Wisconsin, and PostDoctoral training in Microbiology and Immunology at Stanford University School of Medicine.

“As an incredible mother and dedicated public servant, Dr. Monarez understands the importance of protecting our children, our communities, and our future. Americans have lost confidence in the CDC due to political bias and disastrous mismanagement. Dr. Monarez will work closely with our GREAT Secretary of Health and Human Services, Robert Kennedy Jr. Together, they will prioritize Accountability, High Standards, and Disease Prevention to finally address the Chronic Disease Epidemic and, MAKE AMERICA HEALTHY AGAIN!”

US Senate panel grills Trump CDC nominee on vaccines

Susan Monarez, President Donald Trump’s nominee to be the director of the Centers for Disease Control and Prevention, testifies during her confirmation hearing before the U.S. Senate Committee on Health, Education, Labor, and Pensions on June 25, 2025. (Photo by Kayla Bartkowski/Getty Images)

Susan Monarez, President Donald Trump’s nominee to be the director of the Centers for Disease Control and Prevention, testifies during her confirmation hearing before the U.S. Senate Committee on Health, Education, Labor, and Pensions on June 25, 2025. (Photo by Kayla Bartkowski/Getty Images)

WASHINGTON — Members of the U.S. Senate Committee on Health, Education, Labor and Pensions pressed President Donald Trump’s nominee to lead the Centers for Disease Control and Prevention about vaccine recommendations Wednesday after the Health and Human Services secretary fired members of a critical vaccine panel this month.

Trump’s pick, former acting CDC Director Susan Monarez, said that she trusted vaccines while defending HHS Secretary Robert F. Kennedy Jr.’s decision this month — widely seen as part of a vaccine-skeptical agenda — to fire all 17 members of the Advisory Committee on Immunization Practices, or ACIP, and recommend eight new members.

“Part of the secretary’s vision in restoring public trust is making sure that the American people can be confident in the way the evidence and science is driving decision-making,” she told senators.

The panel’s seven members — one dropped out this week — will meet Wednesday and Thursday to review data and vote on new vaccine recommendations. The recommendations carry significant weight as insurance providers and federal health programs like Medicaid use them to determine if shots are covered and schools rely on them for immunization mandates.

Cassidy questions

Louisiana Sen. Bill Cassidy, who chairs the committee, said he was concerned about ACIP, especially as a non-CDC staff member is scheduled to give a presentation to the committee about thimerosal, a mercury-based preservative. The panel is expected to vote on approving flu shots that contain the compound.

Lyn Redwood, the former head of Children’s Health Defense, the anti-vaccine group that Kennedy founded, is giving the presentation arguing that thimerosal causes autism. The CDC’s own research shows that thimerosal does not cause autism. 

Cassidy said that while Monarez had no part in this week’s ACIP meeting, or the agenda, he said that “if the ACIP hearing today is being used to sow distrust, I would ask that going forward, that you would make sure that there really was a balanced perspective.”

“Yes, someone can speak as a critic, but there should be someone who is reviewing the overwhelming evidence of the safety of vaccines,” Cassidy, who is a physician, said.

Monarez, who was the agency’s acting director from January to March, said that she trusted vaccines and that immunization was important to save lives.

If Monarez is confirmed by the Senate, she would be the first director of the CDC without a medical degree in nearly 70 years. She has a Ph.D. in microbiology and immunology.

More concerns about vaccine panel

Cassidy was not the only Republican on the panel concerned about the firing of all the members of ACIP.

Alaska Republican Sen. Lisa Murkowski said she was concerned about the backgrounds of the seven new panelists.

“I would hope that one of the things that you would all be looking into is to make sure that these individuals are going to be looking at the science in front of them, (and) leave their political bias at home,” Murkowski said.

Democratic Sens. Patty Murray of Washington state and Angela Alsobrooks of Maryland also pressed Monarez about Kennedy’s actions to fire everyone on the panel.

Murray asked Monarez if the new members of the panel voted to not recommend vaccines, if she would listen to that recommendation.

Monarez sidestepped the question and said the roles at ACIP were difficult to fill and that members needed to pass an ethics process.

“If they have not gone through an ethics approval process they shouldn’t be participating in the meetings,” she said.

Alsobrooks asked Monarez if she believed the 17 members fired from ACIP lacked qualifications.

Monarez did not answer the question, but said Kennedy’s reasoning for “resetting the ACIP to a new cohort was going to be on the path of restoring public trust.”

Grant funding and layoffs

Senators also raised concerns about grants that had been canceled, even though Congress already approved the funds.

Maine GOP Sen. Susan Collins, who is the chairwoman of the Senate Committee on Appropriations, said that her state is suffering from a high level of Lyme disease and as a result a vaccine was in the works at a research institute in Maine.

“This vaccine is very promising and I want to make sure that it is allowed to continue to its conclusion,” Collins said.

Monarez agreed and said if she is confirmed, she will specifically work to make sure funding for that vaccine continues.

“It’s ironic that our dogs can get a vaccine to protect them against tick-borne illnesses like Lyme disease but we humans can’t and I hope we can remedy that,” Collins said.

Sen. Tim Kaine, Democrat of Virginia, pressed Monarez about the elimination of the Office on Smoking and Health at the CDC. He asked if she was involved in laying off all the staff in April, the month after her brief stint as acting director ended.

“I had no participation in (the layoffs) after I left,” she said.

Fluoride in water

Alsobrooks pressed Monarez about Kennedy’s push to have the CDC stop recommending that low levels of fluoride be placed in public drinking water.

Fluoride is added in drinking water to help prevent cavities, tooth decay and other dental health issues.

Alsobrooks asked Monarez, who is her constituent, if the public water supply that contains fluoride in Potomac, Maryland, where Monarez lives, was safe to drink.

“I believe the water in Potomac, Maryland, is safe,” Monarez said. 

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