Robert F. Kennedy Jr. makes his final plea before senators as a key vote hangs in the balance

Robert F. Kennedy Jr.’s frequent questioning of the safety of childhood vaccinations over the years is persisting as an issue in his confirmation hearings to become the Trump administration's top health official. On Thursday, a key Republican quickly raised concerns about Kennedy's views. Sen. Bill Cassidy is a physician who chairs the Senate's health committee, and he opened the day's hearing with tough questions for Kennedy. He asked him to reject a long-discredited theory that vaccines cause autism. Kennedy refused to do so.