WASHINGTON —

Health and Human Services Secretary Robert F. Kennedy Jr. will face serious concerns from senators on Thursday regarding his handling of public health matters, following his decision to force out the recently sworn-in CDC Director Susan Monarez and replace her with Jim O'Neill, who has a background in business.

On Wednesday, more than 1,000 current and former Health and Human Services employees who worked with Kennedy called for his resignation in a letter , accusing him of prioritizing politics over science.

Kennedy has been reshaping the nation's vaccine policies and has voiced skepticism about the safety and effectiveness of long-established shots. He'll be answering questions on Thursday before the Senate Finance Committee .

"The CDC was once the world's mos

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