WASHINGTON (AP) — Republican Sen. Bill Cassidy's support was crucial to Robert F. Kennedy Jr.’s confirmation as Secretary of Health and Human Services. With firings and resignations at the Centers for Disease Control and Prevention now prompting concern about a leadership breakdown at the nation’s leading public health agency, the Louisiana lawmaker and physician is in a tight spot.

The two-term senator — who publicly expressed concern about Kennedy’s anti-vaccination positions before voting to confirm him — has worried aloud about “serious allegations” at the CDC and has called for oversight, without blaming Kennedy.

But he was choosing his words carefully as he returned to Washington this week after the Senate’s August recess and was preparing to question Kennedy during a finance com

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