The turmoil at the Centers for Disease Control and Prevention as Health and Human Services Secretary Robert F. Kennedy Jr. pushed out the director after clashing over his approach to vaccines has generated bipartisan concern and put a spotlight on a key senator who was instrumental in Kennedy securing his job.

CDC Director Susan Monarez was fired following a dispute with Kennedy over vaccination policy. After Monarez's termination, resignation letters followed on Aug. 27 from CDC Chief Medical Officer Debra Houry and top officials for immunization and contagious diseases.

Sen. Bill Cassidy, R-Louisiana, responded with a social media post on Aug. 27 saying, “These high profile departures will require oversight” by a Senate committee he chairs.

The shakeup comes after Kennedy was

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