Cassidy’s Trump impeachment vote ends his Senate career in Louisiana

Bill Cassidy’s effort to reconcile with Donald Trump ended where it began, with Louisiana Republicans treating his 2021 impeachment vote as a career-defining break. In the state’s May 16 Republican Senate primary, Cassidy finished third and was eliminated, while Trump-backed Julia Letlow and state Treasurer John Fleming advanced to a June 27 runoff.

Cassidy had voted on February 13, 2021, to convict Trump at the Senate’s second impeachment trial over the Jan. 6 attack on the United States Capitol. Afterward, Cassidy said Trump was guilty and that the Constitution and the country were more important than any one person. The Louisiana Republican Party moved quickly to censure him, and the rebuke from the state’s conservative base became a lasting vulnerability in every race that followed.

By 2026, Cassidy was one of only three Republican senators from the group of seven who voted to convict Trump and were still serving in the chamber. That small number underscored how rare the vote had become inside the party, and how steep the political cost remained for Republicans who crossed Trump at a moment of maximum pressure. Trump kept attacking Cassidy as disloyal over the years, including during the 2026 campaign, and Cassidy’s attempt to satisfy Trump and his supporters never erased the original conviction vote.

The Louisiana result also reflected Trump’s continued strength in the state. He won Louisiana’s 2024 presidential election with 1,208,505 votes, or 60.2 percent, and Letlow entered the primary with Trump’s endorsement. Cassidy’s defeat showed that even partial reconciliation with Trump did not guarantee survival in Republican primaries, where one impeachment vote still carried more weight than years of accommodation. For GOP officeholders, the lesson from Louisiana was stark: once Trump’s base has marked a senator as disloyal, the penalty can endure all the way to the next ballot.