Why is Bill Cassidy So Afraid of Robert F. Kennedy Jr.?
Kennedy broke a promise to the Republican senator that he wouldn’t meddle with vaccine policy. Why won’t Cassidy call him out?

Bill Cassidy, the moderate Republican senator who helms the Senate Health Committee, gave a feeble reaction to the committee’s Wednesday hearing with fired CDC Director Susan Monarez.
As a physician, Cassidy’s pro-vaccination stance has put him at odds with President Trump’s anti-vax health secretary, Robert F. Kennedy Jr., whom Cassidy voted to confirm in February. At a September 4 hearing, for instance, the Louisiana senator questioned how Kennedy could reconcile being staunchly anti-vaccine while heaping praise on his boss’s 2020–21 initiative to develop and distribute Covid-19 vaccines. Kennedy’s answers laid bare his cravenness.
But Cassidy had his own low moment Wednesday. Seemingly keeping his own political future in mind, he remained reticent after Monarez’s testimony.
As he seeks reelection in 2026, Cassidy faces a competitive GOP primary. He is already on the president’s bad side—due to his past criticism of and impeachment vote against Trump—and his chances would worsen if Trump were to publicly oppose him. Before the hearing, a Republican source close to the White House told CNN, “The White House is watching” and that Cassidy could “seal his own fate” with the hearing—“if he hasn’t already”—if it was perceived as too anti-Kennedy.
Perhaps that accounts for Cassidy’s tight-lipped response to the hearing—during which Monarez revealed that RFK Jr. told her to either fire CDC scientists and rubber-stamp recommendations by his overhauled vaccine advisory committee, or resign.
After the damning testimony, CNN congressional correspondent Manu Raju reported on X that he could only eke out the following answer from Cassidy on Monarez’s claims: “I’ll let her speak for herself.” Pressed further on his feelings about the hearing, the senator replied, “What do you think?” before disappearing behind closing elevator doors.