RFK Jr. is on the defensive over his vaccine views as a key confirmation vote hangs in the balance

Robert F. Kennedy Jr.'s long record of doubting the safety of childhood vaccinations persisted as a flash point for him Thursday in a confirmation hearing where senators, including a key Republican, shared intensely personal details about the impact vaccine skepticism had on their lives.

In one response, Kennedy refused to flatly reject a long-discredited theory that vaccines cause autism, despite years of studies and research that have found they do not.

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