In a heated Senate hearing, Louisiana Sen. Bill Cassidy challenged HHS Secretary Robert F. Kennedy Jr. over his vaccine policies, advisory panel appointments, and support for Trump’s Operation Warp Speed.

Last month, Cassidy voiced concern after Kennedy's June firing of the CDC's Advisory Committee on Immunization Practices. Cassidy had noted “serious allegations” about the outside group of experts that has been reshaped by Kennedy, a leading anti-vaccine activist before becoming the nation’s top health official.

Senator Bill Cassidy, a Republican physician and vaccine proponent who is facing a primary challenge from the right, has a fraught relationship with the health secretary.

In a heated Senate grilling Thursday, Sen. Bill Cassidy (R-La.) read emails to HHS Secretary Robert F. Kennedy Jr. from several people who say they’ve been denied vaccines after recent CDC

Louisiana Sen. Bill Cassidy (R) wrote to HHS Secretary RFK Jr., urging his support of the whooping cough vaccine amid a nationwide outbreak.