Cassidy Loses Louisiana Primary as Trump Completes Revenge Against Republican Impeachment Voters

The Result

Sen. Bill Cassidy, a two-term Louisiana Republican, finished third in the state’s open primary on May 16, with roughly 25 percent of the vote when the Associated Press called the race. Rep. Julia Letlow — endorsed by President Trump — led the field with about 45 percent. Louisiana State Treasurer John Fleming, also a Trump ally, took second with 28 percent. Cassidy did not make the June 27 runoff.

He is the first sitting Republican senator to lose renomination in nearly a decade, and the first to be punished by primary voters specifically for casting an impeachment vote against Trump.

The Vote That Cost Him

Five years ago, in February 2021, Cassidy was one of seven Republican senators who voted to convict Donald Trump in his second impeachment trial — the trial that followed Trump’s incitement of the January 6, 2021 attack on the U.S. Capitol. Cassidy explained the vote on the Senate floor: the president of the United States had encouraged a mob to interfere with the certification of an election he had lost, people had died, and the Constitution did not permit a former president to be immunized from accountability simply because his term had ended.

Trump never forgot. He spent the better part of two years calling Cassidy a “disloyal disaster” on Truth Social, recruited Letlow — a Republican congresswoman from a deep-red district — to run against him, and converted the primary into an in-kind referendum on whether voting to hold Trump accountable for January 6 should be politically survivable inside the GOP.

It was not. With Cassidy’s loss, four of the seven Republicans who voted to convict Trump have now either been forced into retirement or defeated. Two of the remaining three are not on the ballot until 2028. Only one — Sen. Lisa Murkowski of Alaska — has so far survived a primary challenge, and only because Alaska uses a top-four jungle primary with ranked-choice voting in the general.

The Pattern of Revenge

The Cassidy defeat is not an isolated event. It is the latest in a sustained, deliberately public campaign by Trump to liquidate any Republican who has ever crossed him. Earlier in May, Trump backed primary challengers against Indiana Republicans who opposed his redistricting demands, in an effort openly described by his own advisers as “revenge redistricting.” The pattern is the same in Louisiana: a target is selected on the basis of a single act of disloyalty, the president personally bankrolls the challenger, and the party falls in line behind the punishment.

Trump’s grip on the GOP is no longer just ideological. It is enforcement-based: cross him once, on any vote, and your career ends in a primary you cannot win. Letlow herself, in interviews leading up to the primary, did not argue that Cassidy was a bad senator on policy. She argued that he was “disloyal” — the same word Trump used. That is the standard now.

Why It Matters

The American constitutional system depends on senators being willing, occasionally, to put institutional duty above partisan loyalty. The impeachment power exists precisely so that legislators of the president’s own party can punish abuses of office, including abuses that culminate in violence. Cassidy did exactly what the Constitution envisions a senator doing in that situation. He voted on the evidence. He explained his reasoning.

He has now been removed from office for it — not by the voters of Louisiana writ large, who never got to weigh in, but by a closed Republican primary effectively run as a loyalty audit by the man he voted to convict. The lesson sent to every Republican still in Congress is unmistakable: if Trump is ever again accused of a high crime or misdemeanor, the vote to acquit is the only safe vote, regardless of the evidence. That is the equilibrium Trump has built. The Cassidy result locks it in.

The same weekend Cassidy lost, the Trump administration was finalizing a $1.7 billion taxpayer-funded compensation deal for the same Jan. 6 defendants Cassidy had voted to hold Trump accountable for inciting. The juxtaposition is the story of the Republican Party in 2026 in a single weekend: the man who voted against the insurrection is out of office, and the people who carried it out are being paid.