Sen. Ron Wyden accused Health and Human Services Sec. Robert F. Kennedy Jr. of putting children in harm's way during a heated Senate hearing on Thursday.

HHS Secretary Robert F. Kennedy Jr. testifies before Senate Finance Thursday morning. You should be watching how Sen. Bill Cassidy questions him.

Sen. Thom Tillis, a Republican from North Carolina, pointed out some contradictory statements HHS Secretary Robert F. Kennedy Jr. has made and asked him to clarify his stance on Operation Warp Speed and explain why he fired the CDC director.

The hearing has ended after nearly three hours. At many times contentious, Kennedy was grilled on everything from vaccine availability to his staffing shakeups at the CDC. Several Republicans on the panel expressed concern on vaccines,

Kennedy, Jr., Secretary of Health and Human Services, testifies about the health care agenda for the Trump administration in front of the Senate Committee on Finance in Washington, D.C., on September 4,

Health and Human Services Secretary Robert F. Kennedy Jr. said he fired CDC head Susan Monarez because she told him "no" when he asked if she was trustworthy.