Former Centers for Disease Control and Prevention Director Susan Monarez delivered an explosive account of her firing on Capitol Hill Wednesday, telling lawmakers she was ousted after refusing to compromise scientific integrity under pressure from Health and Human Services Secretary Robert F. Kennedy Jr.
Appearing before the Senate Health, Education, Labor and Pensions Committee, Monarez made her first public remarks since her abrupt dismissal just 29 days after being unanimously confirmed by Senate Republicans.
“I was fired for holding the line on scientific integrity,” Monarez said. “I would not agree to fire career scientists or pre-approve vaccine recommendations before the evidence was reviewed. That is the true reason I was pushed out.”
Monarez alleged that in a private meeting, Kennedy demanded she back upcoming changes to the childhood vaccine schedule and remove senior CDC officials overseeing vaccine policy. She claimed Kennedy told her the White House was already on board, despite the absence of any scientific data.
“He said there was no science or evidence supporting the childhood vaccine schedule, but that he still expected me to change it,” Monarez testified. “I told him I would only support changes if the evidence warranted it.”
Her testimony contradicted Kennedy’s earlier denials before the Senate Finance Committee, where he insisted Monarez had called herself “untrustworthy” and offered to resign. In a fiery exchange with Sen. Elizabeth Warren (D-Mass.), Kennedy defended his decision, saying: “If you had an employee who told you they weren’t trustworthy, would you keep them?”
The spectacle has rattled Washington, with even Republican allies questioning Kennedy’s handling of the situation. Senate HELP Chairman Bill Cassidy (R-La.), who once voted to confirm Kennedy, pressed Monarez to explain the breakdown. “Did we fail?” Cassidy asked. “Was there something we should have done differently?”
Monarez was joined by Deb Houry, former CDC chief medical officer, who resigned alongside three other top officials in protest of her ouster. The coordinated departures fueled fears that the administration’s vaccine agenda is being driven by politics rather than science.
Kennedy, however, has stood by the shake-up, canceling $500 million in mRNA vaccine contracts and replacing CDC advisory committees with his own appointees, some of whom have expressed skepticism about vaccines. He insists the changes are “necessary adjustments to restore the CDC’s credibility.”
But critics across the aisle are alarmed. Sen. Lisa Blunt Rochester (D-Del.) called Kennedy “unsafe for America,” while Senate Majority Leader John Thune (R-S.D.) said Kennedy must “take responsibility.” Even longtime ally Sen. Susan Collins (R-Maine) admitted she saw “no justification” for Monarez’s termination.
The stakes extend far beyond a personnel dispute. The reconstituted CDC vaccine advisory panel is set to review recommendations for childhood vaccines such as MMRV and RSV in the coming weeks. With no permanent CDC director in place, Monarez warned that policy could shift dramatically.
“Based on what I observed during my tenure, there is real risk that recommendations could be made restricting access to vaccines for children and others in need without rigorous scientific review,” she cautioned.
The fight over Monarez’s firing has now become a proxy battle over the future of U.S. vaccine policy under Kennedy’s leadership. For many, her testimony crystallized a fundamental question: is science still driving the nation’s public health decisions, or has politics taken the wheel?