Former top U.S. vaccine official Rick Bright on May 14 testified that the United States still lacked a coordinated plan to combat the coronavirus pandemic. (Video: Reuters)

A Trump administration vaccine expert who says he was removed from a key role for raising concerns about the federal government’s coronavirus response — and its promotion of unproven drugs to treat the virus — testified Thursday before Congress.

Rick Bright became a whistleblower after being removed from his post as director of the Biomedical Advanced Research and Development Authority (BARDA), which falls under the Department of Health and Human Services.