RFK Jr. begins confirmation hearings amid claims of alleged drug-fueled gatherings, blending animals and controversial vaccine stances.

Robert F. Kennedy Jr. is expected to reject characterizations of him as an anti-vaxxer in a Senate hearing Wednesday where senators will weigh his confirmation as Health and Human Services Secretary—as his former billionaire running mate threatens to fund primary challenges against lawmakers who vote against him.

With most Democrats expected to vote against him, Robert F. Kennedy Jr.’s bid for health secretary will come down whether he can win over skeptics in President Trump’s party.

For the first time in modern American history, a skeptic of medical research could be responsible for safeguarding public health.

Robert F. Kennedy Jr. has said vaccines are not safe. His support for abortion access has made conservatives uncomfortable.