Kennedy appeared on Wednesday and Thursday in front of the Senate’s finance and health committees, giving independent Sen. Bernie Sanders and Sen. Peter Welch, a Democrat, a chance to weigh in.

Sen. Bernie Sanders joins Chris Hayes to discuss the RFK Jr confirmation hearing, the threat of oligarchy in America, Trump’s ...

Robert F. Kennedy, President Trump’s nominee for health secretary, vigorously defended his views on vaccines, and a key senator still has clear doubts.