Three of President Donald Trump’s most vulnerable Cabinet nominees appeared in front of Senate panels for their confirmation hearings this week. Robert F. Kennedy Jr., the nominee for secretary of Health and Human services,

Sen. Elizabeth Warren discussed her viral back-and-forth with RFK Jr. on Thursday during an interview on "The View," saying the U.S. could be left with "no vaccines."

Sen. Bill Cassidy, the top Republican on the Senate Committee on Health, Education, Labor and Pensions, concluded Thursday's hearing by saying he was "struggling" with the nomination due to Kennedy's vaccine positions. Kennedy notably refused to say vaccines don't cause autism as he faced pointed question from lawmakers.