"The committee has been plagued with persistent conflicts of interest and has become little more than a rubber stamp for any vaccine," he wrote in an op-ed for The Washington Post. "It has never recommended against a vaccine—even those later withdrawn for safety reasons."

U.S. health officials have expanded warnings about a rare heart side effect associated with the two leading COVID-19 vaccines.

The Food and Drug Administration said Wednesday it was expanded existing warnings on the two leading COVID vaccines about a rare heart side effect mainly seen in young men, despite previous guidance from the Centers for Disease Control and Prevention that said there was no increased risk.