Republican senators are sending clear signs of disapproval and unhappiness with Secretary of Health and Human Services Robert F. Kennedy, Jr., making it plain to President Trump that they want the administration to address the chaos that Kennedy has caused by trying to rewrite the nation’s vaccine policies.

GOP senators have stopped short of calling on Kennedy to resign and haven’t yet said they regret voting for him in February, but they want him to back off efforts to change vaccine policy recommendations without sound scientific backing as the administration faces a growing public backlash.

Kennedy received an unusual admonishment from Senate Republican Whip John Barrasso (R-Wyo.), an orthopedic surgeon, when he testified before the Senate Finance Committee on Thursday.

“I support va

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