WASHINGTON — Sen. Bill Cassidy, R-La., the chair of the health committee, is holding his cards close to the vest, declining to elaborate after he said he will conduct “oversight” of the country's top health official and a recent shake-up at the Centers for Disease Control and Prevention. Cassidy, a doctor who has been supportive of vaccines, is in a delicate position as the top Republican on the Health, Education, Labor and Pensions Committee who provided a pivotal vote to confirm Health and Human Services Secretary Robert F. Kennedy Jr. after he secured assurances about vaccines. Cassidy is also running for re-election next year.

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