Politics · Louisiana GOP Primary · May 17, 2026 · 11:00 AM ET

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Louisiana Just Ended Bill Cassidy’s Senate Career — Five Years After the Impeachment Vote.

On February 13, 2021, two-term U.S. Senator Bill Cassidy (R-LA) voted to convict Donald Trumpin the second impeachment trial. He was one of seven Senate Republicans who did. He explained the vote in a one-sentence floor statement that has followed him ever since: “Our Constitution and our country is more important than any one person. I voted to convict President Trump because he is guilty.”

On Saturday, May 16, 2026, Louisiana Republican primary voters returned the verdict. Cassidy finished third, at roughly 25%, behind Rep. Julia Letlow (R-LA) at ~45% and Louisiana State Treasurer John Fleming (R) at ~28%. Letlow had Trump’s endorsement. Fleming and Letlow advance to the June 27 runoff. Cassidy advances to nothing.

He is the first sitting U.S. Senator to lose a renomination primary since 2017, per Roll Call. Of the seven Republican senators who voted to convict Trump in February 2021, only two are still in the Senate today. Cassidy outspent both Letlow and Fleming combined and still finished third. Incumbency, money, and the chairmanship of the Senate HELP Committee were not enough to outrun a five-year-old vote.

• ~25%Cassidy's third-place finish in the May 16, 2026 Louisiana GOP Senate primary — AP, CNN, NBC projections
• ~45%Julia Letlow's first-place finish — Trump-endorsed Republican who advances to the June 27 runoff
• ~28%John Fleming's second-place finish — Louisiana State Treasurer, former U.S. Rep., advances to runoff
• 2 of 7Republican senators left in the Senate who voted to convict Trump in 2021 — Susan Collins (R-ME) and Lisa Murkowski (R-AK)
• 2017Last time a sitting U.S. Senator lost a renomination primary before Cassidy — Roll Call
• 0 daysBetween Cassidy's primary loss and Trump's Truth Social declaration that 'his political career is OVER'

Cassidy was one of seven Senate Republicans who crossed the aisle on the second day of the second impeachment trial. The seven: Richard Burr (R-NC), Bill Cassidy (R-LA), Susan Collins (R-ME), Lisa Murkowski (R-AK), Mitt Romney (R-UT), Ben Sasse (R-NE), and Pat Toomey (R-PA). Conviction required 67 votes. The Senate fell ten short, 57-43.

“Our Constitution and our country is more important than any one person. I voted to convict President Trump because he is guilty.”

Sen. Bill Cassidy (R-LA) · Senate floor statement · Feb. 13, 2021

The Louisiana Republican Party censured him within weeks. The political consequences in Washington were minimal — he chaired the Senate HELP Committee, retained committee assignments, kept the seat. The political consequences in Louisiana took five years to arrive at the ballot box. They arrived on May 16, 2026.

Trump endorsed Letlow months before the primary on Truth Social. Letlow declared her candidacy three days later. The Trump operation, Letlow’s 5th-district House network, and Louisiana’s closed Republican primary structure aligned. Cassidy spent more than both challengers combined. The money did not move the result.

Polls closed Saturday evening. Within hours, AP, CNN, NBC, and Decision Desk HQ all projected Cassidy defeated. Letlow took the stage at her victory party flanked by her children. Cassidy delivered a concession speech that did not name Trump but did not have to.

“Let me just set the record straight: Our country is not about one individual. It is about the welfare of all Americans and it is about our Constitution. And if someone doesn't understand that and attempts to control others through using the levers of power, they're about serving themselves.”

Sen. Bill Cassidy (R-LA) · concession speech · May 16, 2026

“But you don't pout, you don't whine.”

Sen. Bill Cassidy (R-LA) · concession follow-on · May 16, 2026

Letlow’s victory remarks were less restrained: “I want to say thank you to a very special man who you all know, the best president this country has ever had, President Donald Trump.” She told NBC that Cassidy’s 2021 impeachment vote was “a sign that he had turned his back on the Louisiana voters.”

Trump posted on Truth Social within hours of the result. He did not soften.

Of the seven Republican senators who voted to convict Trump in February 2021, only two remain in the Senate as of today.

Six of the seven are now out of the Senate. Five exited on their own terms; one was forced out by his own primary voters. The two who remain — Susan Collins (R-ME) and Lisa Murkowski (R-AK)— sit in the only two Republican Senate seats whose state-level dynamics (Maine’s independent streak, Alaska’s ranked-choice ballot) make a Trump-backed primary purge meaningfully harder. Cassidy did not have those structural protections.

The June 27 runoff is between two Republicans. Louisiana is safely Republican; the seat is not in play in November. The general-election consequence is zero. The intra-party consequence is the entire story.

Cassidy chaired the Senate HELP Committee, an A-list committee gavel. He had the policy portfolio (hospital pricing, drug pricing, mental-health legislation, ACA stabilization) most other senators spend a decade trying to assemble. None of it saved him. Letlow’s pitch to Louisiana Republican voters was, in substance, one sentence: he voted to convict Trump. Voters answered with one number: ~25%.

For the 219 House Republicans currently in office, the signal is the entire point. A primary loss for a two-term incumbent senator who chairs an A-list committee, who outspent his challengers combined, who had built two decades of Louisiana political relationships, is the most expensive single demonstration of the price of dissent the Trump-era GOP has yet produced. The next time a House or Senate Republican considers a vote against a Trump priority, the data point is now: five years later, you still pay.