Robert F. Kennedy Jr.'s bid to be the nation's top health official is uncertain after a key Republican joined Democrats to raise persistent concerns over the nominee's deep skepticism of routine childhood vaccinations that prevent deadly diseases.

Sen. Bill Cassidy (R), a physician-turned-politician from deep-red Louisiana, has emerged as a central figure in the confirmation fight over Robert F. Kennedy Jr. to lead the Department of Health and Human Services.

Louisiana State Treasurer John Fleming, who is seeking to oust Sen. Bill Cassidy in 2026, is calling the senator a "RINO," or "Republican in name only."

Robert F. Kennedy Jr.’s opinions about vaccine safety, both past and present, appeared likely to lead at least a few Senate Republicans to vote against his nomination following a second confirmation hearing Thursday.

Robert F. Kennedy Jr. goes before two two U.S. Senate hearings in his quest to head the nation's health department. Louisiana Sen. Bill Cassidy, a doctor, sits on both.

Heath and Human Services Secretary-nominee Robert F. Kennedy Jr. on Thursday faced a second round of Senate confirmation testimony, which this time included tough questions from three Republican lawmakers, each of whom are doctors.

Lisa Murkowski (R-Alaska) and Bill Cassidy (R-La.) on Tuesday criticized President Trump ... Susan Collins (R-Maine) is the only other GOP senator who voted to convict Trump who is still in Congress.

Sen. Bill Cassidy (R-La.) announced that he will vote to confirm Pete Hegseth, President-elect Trump’s pick for Defense Secretary, increasing the nominee’s chances of becoming the next head

Kennedy, tapped by Trump to lead HHS, struggled to ease concerns held by on-the-fence GOP senators over his long history of vaccine skepticism.

“We have to do that because we have very big deficits with those countries,” Trump told reporters Thursday, adding that the tariffs “may or may not rise with time.” Trump also complained that both countries had not done enough to curb illegal migrants and fentanyl coming across the U.S. border.

“Bobby! Bobby!” Supporters decked out in MAHA (“Make America Healthy Again”) pins and hats chanted this as Robert F. Kennedy Jr., President Donald Trump’s nominee for health secretary, entered a packed room for his Senate Finance Committee confirmation hearing on Wednesday.