Seven months after they voted to confirm longtime anti-vaccine activist Robert F. Kennedy Jr. as the nation’s health secretary, some Republican senators are having second thoughts.

“I’m a doctor. Vaccines work,” Sen. John Barrasso (Wyoming), the Senate’s No. 2 Republican, told Kennedy at a hearing Thursday on Capitol Hill. “Secretary Kennedy, in your confirmation hearings, you promised to uphold the highest standards for vaccines. Since then, I’ve grown deeply concerned.”

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