Fired CDC chief Susan Monarez warns senators that RFK Jr. is endangering public health

WASHINGTON (AP) — America’s public health system is headed to a “very dangerous place” with Health Secretary Robert F. Kennedy Jr. and his team of anti-vaccine advisers in charge, fired Centers for Disease Control and Prevention chief Susan Monarez warned senators on Wednesday.

Describing extraordinary turmoil inside the nation's health agencies, Monarez and former CDC Chief Medical Officer Chief Debra Houry described exchanges in which Kennedy or political advisers rebuffed data supporting the safety and efficacy of vaccines.

Monarez, who was fired after just 29 days on the job following disagreements with Kennedy, told senators deadly diseases like polio and whooping cough, long contained, are poised to make a comeback in the U.S.

“I believe preventable diseases will return, and I believe we will have our children harmed by things they don’t need to be harmed by,” Monarez said before the Senate health committee.

Monarez said she was ordered by Kennedy to resign if she did not sign off on new vaccine recommendations, which are expected to be released later this week by an advisory panel that Kennedy has stocked with medical experts and vaccine skeptics. She said that when she asked for data or science to back up Kennedy’s request to change the childhood vaccination schedule, he offered none.

She added that Kennedy told her “he spoke to the president every day about changing the childhood vaccination schedule.”

Republican Sen. Bill Cassidy, a physician who chairs the powerful health committee, listened intently as Monarez and Houry described conversations with Kennedy and his advisers.

“To be clear, he said there was not science or data, but he still expected you to change schedule?” Cassidy asked.

Cassidy carefully praised President Donald Trump for his commitment to promoting health policies but made it clear he was concerned about the circumstances surrounding Monarez's removal.

Houry, meanwhile, described similar exchanges with Kennedy's political advisers, who took an unprecedented role in preparing materials for meetings of the CDC's advisory vaccine panel.

Ahead of this week's meeting of the panel, Houry offered to include data around the hepatitis B shot that is administered to newborns to prevent spread of the deadly disease from the mother. She said a Kennedy adviser dismissed the data as biased because it might support keeping the shots on the schedule.

"You’re suggesting that they wanted to move away from the birth dose, but they were afraid that your data would say that they should retain it?" Cassidy asked.

During the Senate hearing, Democrats, all of whom opposed Monarez's nomination, also questioned Kennedy's motives for firing Monarez, who was approved for the job unanimously by Republicans.

“Frankly, she stood up for protecting the well-being of the American people, and for that reason she was fired,” said Sen. Bernie Sanders, an independent from Vermont who caucuses with Democrats.

Monarez said it was both her refusal to sign off on new vaccination recommendations without scientific evidence and her unwillingness to fire high-ranking career CDC officials without cause that led to her ousting.

Kennedy has denied Monarez’s accusations that he ordered “rubber-stamped” vaccine recommendations but has acknowledged he demanded firings. He has described Monarez as admitting to him that she is “untrustworthy,” a claim Monarez has denied through her attorney.

While Senate Republicans have been mostly loath to challenge Trump or even Kennedy, many of them have expressed concerns about the lack of availability of COVID-19 vaccines and the health department’s decisions to scale back some childhood vaccines.

Others have backed up Kennedy’s distrust of the nation’s health agencies.

Kansas Sen. Roger Marshall, a doctor, aggressively questioned Monarez about her “philosophy” on vaccines as she explained that her decisions were based on science. Alabama Sen. Tommy Tuberville said Trump was elected to make change and suggested Monarez's job was to be loyal to Kennedy.

“America needs better than this,” Tuberville said.

The Senate hearing was taking place just a day before the vaccine panel starts its two-day session in Atlanta to discuss shots against COVID-19, hepatitis B and chickenpox. It’s unclear how the panel might vote on the recommendations, though members have raised doubts about whether hepatitis B shots administered to newborns are necessary and have suggested COVID-19 recommendations should be more restricted.

The CDC director must endorse those recommendations before they become official. Health and Human Services Deputy Secretary Jim O’Neill, now serving as the CDC’s acting director, will be responsible for that.

“I'm very nervous about it,” Monarez said of the meeting.

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Associated Press writers Mike Stobbe in New York and Lauran Neergaard in Washington contributed.

Former Centers for Disease Control and Prevention Director Susan Monarez testifies before the Senate Committee on Health, Education, Labor, and Pensions hearing to examine reviewing recent events at the Centers for Disease Control and Prevention and implications for children's health on Capitol Hill, in Washington, Wednesday, Sept. 17, 2025. (AP Photo/Jose Luis Magana)

Former Centers for Disease Control and Prevention Director Susan Monarez testifies before the Senate Committee on Health, Education, Labor, and Pensions hearing to examine reviewing recent events at the Centers for Disease Control and Prevention and implications for children's health on Capitol Hill, in Washington, Wednesday, Sept. 17, 2025. (AP Photo/Jose Luis Magana)

Senate Committee on Health, Education, Labor, and Pensions ranking member Sen. Bernie Sanders, I-Vt., speaks during a hearing to examine reviewing recent events at the Centers for Disease Control and Prevention and implications for children's health on Capitol Hill, in Washington, Wednesday, Sept. 17, 2025. (AP Photo/Jose Luis Magana)

Former Centers for Disease Control and Prevention Director Susan Monarez testifies before the Senate Committee on Health, Education, Labor, and Pensions hearing to examine reviewing recent events at the Centers for Disease Control and Prevention and implications for children's health on Capitol Hill, in Washington, Wednesday, Sept. 17, 2025. (AP Photo/Jose Luis Magana)

Former Centers for Disease Control and Prevention Director Susan Monarez testifies before the Senate Committee on Health, Education, Labor, and Pensions hearing to examine reviewing recent events at the Centers for Disease Control and Prevention and implications for children's health on Capitol Hill, in Washington, Wednesday, Sept. 17, 2025. (AP Photo/Jose Luis Magana)

Former Centers for Disease Control and Prevention Director Susan Monarez testifies before the Senate Committee on Health, Education, Labor, and Pensions hearing on Capitol Hill, in Washington Wednesday, Sept. 17, 2025. (AP Photo/Jose Luis Magana)

FILE - Susan Monarez, President Donald Trump's nominee to be director of the Centers for Disease Control and Prevention, arrives to testify before the Senate HELP Committee, at the Capitol in Washington, June 25, 2025. (AP Photo/J. Scott Applewhite, File)

WASHINGTON (AP) — The Supreme Court is taking up one of the term’s most consequential cases, President Donald Trump’s executive order on birthright citizenship declaring that children born to parents who are in the United States illegally or temporarily are not American citizens, and he arrived at the court Wednesday to attend the arguments.

The justices will hear Trump’s appeal of a lower-court ruling from New Hampshire that struck down the citizenship restrictions, one of several courts that have blocked them. They have not taken effect anywhere in the country.

A definitive ruling is expected by early summer.

Trump will be the first sitting president to attend oral arguments at the nation’s highest court.

Crowds watched from the sidewalks as Trump’s motorcade drove along Constitution and Independence Avenues, passing the Washington Monument and the National Mall on the way to the court building.

The case frames another test of Trump's assertions of executive power that defy long-standing precedent for a court that has largely ruled in the president's favor — but with some notable exceptions that Trump has responded to with starkly personal criticisms of the justices.

The birthright citizenship order, which Trump signed the first day of his second term, is part of his Republican administration’s broad immigration crackdown.

Birthright citizenship is the first Trump immigration-related policy to reach the court for a final ruling. The justices previously struck down global tariffs Trump had imposed under an emergency powers law that had never been used that way.

Trump reacted furiously to the late February tariffs decision, saying he was ashamed of the justices who ruled against him and calling them unpatriotic.

He issued a preemptive broadside against the court on Sunday on his Truth Social platform. “Birthright Citizenship is not about rich people from China, and the rest of the World, who want their children, and hundreds of thousands more, FOR PAY, to ridiculously become citizens of the United States of America. It is about the BABIES OF SLAVES!,” the president wrote. “Dumb Judges and Justices will not a great Country make!”

Trump's order would upend the long-standing view that the Constitution’s 14th Amendment, ratified in 1868, and federal law since 1940 confer citizenship on everyone born on American soil, with narrow exceptions for the children of foreign diplomats and those born to a foreign occupying force.

The 14th Amendment was intended to ensure that Black people, including former slaves, had citizenship, though the Citizenship Clause is written more broadly. “All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside,” it reads.

In a series of decisions, lower courts have struck down the executive order as illegal, or likely so, under the Constitution and federal law. The decisions have invoked the high court's 1898 ruling in Wong Kim Ark, which held that the U.S.-born child of Chinese nationals was a citizen.

The Trump administration argues that the common view of citizenship is wrong, asserting that children of noncitizens are not “subject to the jurisdiction” of the United States and therefore are not entitled to citizenship.

The court should use the case to set straight “long-enduring misconceptions about the Constitution’s meaning,” Solicitor General D. John Sauer wrote.

No court has accepted that argument, and lawyers for pregnant women whose children would be affected by the order said the Supreme Court should not be the first to do so.

“We have the president of the United States trying to radically reinterpret the definition of American citizenship,” said Cecillia Wang, the American Civil Liberties Union legal director who is facing off against Sauer at the Supreme Court.

More than one-quarter of a million babies born in the U.S. each year would be affected by the executive order, according to research by the Migration Policy Institute and Pennsylvania State University’s Population Research Institute.

While Trump has largely focused on illegal immigration in his rhetoric and actions, the birthright restrictions also would apply to people who are legally in the United States, including students and applicants for green cards, or permanent resident status.

Follow the AP’s coverage of the U.S. Supreme Court at https://apnews.com/hub/us-supreme-court.

Demonstrators holding opposing views verbally engage ahead of President Donald Trump's arrival at the U.S. Supreme Court, Wednesday, April 1, 2026, in Washington. (AP Photo/Tom Brenner)

President Donald Trump's limo exits the White House en route to the Supreme Court, Wednesday, April 1, 2026, in Washington. (AP Photo/Mark Schiefelbein)

President Donald Trump's motorcade arrives at the U.S. Supreme Court, Wednesday, April 1, 2026, in Washington. (AP Photo/Tom Brenner)

Pro and anti-Trump demonstrators rally outside the U.S. Supreme Court, before justices hear oral arguments on whether President Donald Trump can deny citizenship to children born to parents who are in the United States illegally or temporarily, on Capitol Hill, in Washington, Wednesday, April 1, 2026. (AP Photo/J. Scott Applewhite)

People arrive to walk inside the U.S. Supreme Court, on Capitol Hill in Washington, Wednesday, April 1, 2026. The Supreme Court justices will hear oral arguments today on whether President Donald Trump can deny citizenship to children born to parents who are in the United States illegally or temporarily. (AP Photo/J. Scott Applewhite)

People arrive to walk inside the U.S. Supreme Court, on Capitol Hill in Washington, Wednesday, April 1, 2026. The Supreme Court justices will hear oral arguments today on whether President Donald Trump can deny citizenship to children born to parents who are in the United States illegally or temporarily. (AP Photo/J. Scott Applewhite)

President Donald Trump answers questions from reporters after signing an executive order in the Oval Office of the White House Tuesday, March 31, 2026, in Washington, as Commerce Secretary Howard Lutnick listens. (AP Photo/Alex Brandon)

The U.S. Supreme Court is seen as the moon rises Tuesday, March 31, 2026, in Washington. (AP Photo/Jose Luis Magana)