Robert F. Kennedy Jr.’s tumultuous tenure atop the US Health and Human Services Department is starting to wear on some prominent Republicans.

But so far, President Donald Trump is not one of them.

Trump aides and advisers cheered Kennedy’s combative performance at a Senate hearing on Thursday, casting it as the fiery display he needed to solidify his standing within the administration following days of controversy.

Kennedy mounted an aggressive defense of his abrupt moves to fire the head of the Centers for Disease Control and Prevention and impose new restrictions on Covid-19 vaccine eligibility — decisions that caught even some White House officials off guard. He confronted Democratic and Republican senators alike over their criticisms, at multiple points brushing away questions by de

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