Though a strong promoter of vaccinations, Cassidy persuaded wary fellow Republicans to confirm Kennedy, President Donald Trump’s nominee to run the U.S. Department of Health & Human Services.

Democrats on the Senate Health Committee launched an investigation on Tuesday into Health and Human Services Secretary Robert F. Kennedy Jr.’s firing of all members of a Centers for Disease Control and Prevention (CDC) vaccine advisory panel.

Democratic lawmakers on the U.S. Senate's Health, Education, Labor, and Pensions ((HELP) Committee on Tuesday launched an investigation into Health and Human Services Secretary Robert F. Kennedy Jr.’s decision to dismantle a key CDC vaccine advisory panel,