Some Senate Republicans who voted to confirm Robert F. Kennedy Jr. as secretary of Health and Human Services questioned the appointee’s leadership ability on Wednesday, after a tumultuous month at the Centers for Disease Control and Prevention.

Kennedy is set to testify before the Senate Finance Committee on Thursday, his first appearance before the panel. The hearing was announced before he fired CDC Director Susan Monarez and other highly placed public health officials resigned in solidarity last month.

“It has not increased confidence in the institution of public health, the chaos that he’s created,” Sen. John Kennedy, R-La., said Wednesday of the health secretary’s personnel decisions. “They need to get their business straight.”

When asked further questions, the senator pointed to r

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