Robert F. Kennedy Jr.’s appearance on Capitol Hill on Thursday quickly broke down into a series of angry denials, fractious name-calling, and even yelling.

The combative tone of the hearing was set from the start as the health and human services secretary’s testimony came with the Centers for Disease Control and Prevention in chaos, with its leadership ousted on top of mass firings.

At the same time, Kennedy has been widely accused of undermining science and the future of America’s vaccine policy.

Every single Democrat on the Senate Finance Committee, before which RFK Jr. testified, called for his resignation moments before the hearing got underway.

While much of Kennedy’s hostilities were directed at Democrats who did nothing to hide their disdain for the secretary, Kennedy also but

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