Watch: Key moments from RFK Jr's heated Senate hearing

The US health secretary faced questions on Covid deaths and vaccines a week after firing the head of the Centers for Disease Control and Prevention.

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When asked whether he accepts that one million Americans died from Covid, he responded: "I don't know how many died... I don't think anybody knows".

Last week the director of the Centers for Disease Control and Prevention, Susan Monarez, was dismissed, which led to other CDC leaders resigning.

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