U.S. lawmakers clashed with Health and Human Services Secretary Robert F. Kennedy Jr. over his changes to the country’s vaccine policy and oversight of the Centers for Disease Control and Prevention, including the recent ouster of director Susan Monarez.

Several members of the Senate Finance Committee called for Kennedy’s resignation at a hearing Thursday amid turmoil at the CDC after Monarez was ousted less than a month after taking the job. In an op-ed published Thursday, Monarez said she was fired for refusing to preemptively sign off on recommendations from Kennedy’s hand-picked vaccine advisory panel, which is set to meet next month.

When questioned on Monarez’s firing by Sen. Ron Wyden, D-Ore., the committee’s senior Democrat, Kennedy accused her of lying. “I did not say that t

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