Congresswoman Julia Letlow defeated state Treasurer John Fleming in Louisiana's Republican Senate primary runoff, clinching the nomination with more than 55 percent of the vote and delivering President Trump another scalp in his 2026 campaign to reshape the GOP conference. The win all but guarantees Letlow a Senate seat this fall in a state Trump carried by 22 points in 2024.
The result caps a months-long effort by Trump to force out incumbent Senator Bill Cassidy, who voted to convict Trump on impeachment charges in 2021, a vote the president never forgot and never forgave.
Trump endorsed Letlow before she even entered the race in January, and his backing proved decisive. In the May 16 primary, Letlow took nearly 45 percent of the vote. Cassidy finished third with roughly 25 percent, not even enough to make the runoff. Fleming, a former congressman and founder of the House Freedom Caucus, landed at about 28 percent and advanced to face Letlow head-to-head.
That runoff was never close.
Trump posted on Truth Social shortly after the results came in, as the Daily Mail reported:
"Julia Letlow WON in Louisiana, beating conclusively a very strong and smart opponent. Congratulations to Julia. She will be a truly GREAT Senator!"
At her election night watch party in Baton Rouge, Letlow returned the favor in kind. She told supporters she was "so filled with gratitude for the greatest president this country has every had, Donald J. Trump," adding, "I am also so incredibly grateful for your endorsement."
Those weren't idle words. During an online rally with Trump before the runoff, Letlow made her posture explicit: "We have a chance to send a clear message that Louisiana stands with President Trump. He endorsed me because he knows I will stand with him."
That kind of full-throated alignment is exactly what Trump wanted when he set out to replace Cassidy. And it's exactly what Republican voters in Louisiana rewarded.
Bill Cassidy's political demise did not happen overnight. After his 2021 impeachment vote, Trump labeled him a "RINO" and made clear the senator's career had an expiration date. Fox News reported that Cassidy became the first elected Republican senator to lose renomination since 2012. Trump celebrated the primary result on social media, declaring "it's nice to see that his political career is OVER!"
Cassidy spent a year trying to keep Trump from coming after him. It didn't work. By the time primary voters weighed in, the senator couldn't crack 25 percent in his own state.
The tensions between Cassidy and the Trump-aligned GOP had been building for years. As National Review noted, Cassidy was one of three remaining Republican senators who voted to convict Trump for incitement of insurrection. That vote made him a target, and MAGA voters delivered the verdict.
After his defeat, Cassidy offered a measured concession: "When you participate in democracy, sometimes it doesn't turn out the way you want it to. But you don't pout. You don't whine. You don't claim that an election was stolen from you."
John Fleming was no moderate. He founded the House Freedom Caucus during his time in Congress, served in Trump's first administration, and ran ads calling himself MAGA "long before it was cool." He reminded voters he didn't resign after January 6, 2021. He staked much of his campaign on opposition to carbon capture and sequestration, citing private property rights concerns and calling federal subsidies for the technology wasteful.
None of it mattered without Trump's endorsement.
Fleming claimed he was blocked from reaching Trump by White House allies of Governor Jeff Landry, who had consulted with Trump about Letlow's candidacy and endorsed her himself. Fleming said he eventually got through. At a June campaign stop, he recounted the conversation: "I said nobody has been more loyal to you than me." Trump's response, as Fleming told it: "You're fantastic! Why didn't you call?"
The financial gap told its own story. Both campaigns spent roughly $1 million on advertising after the May 16 primary. But a super PAC supporting Letlow poured $4.1 million into the race over the same six-week stretch, according to ad-tracking firm AdImpact. That kind of spending advantage, combined with Trump's endorsement and the backing of House Majority Leader Steve Scalise, left Fleming with little room to maneuver.
In a late-campaign gambit, Fleming reposted an AI-generated video on X that purported to show Letlow expressing support for diversity, equity, and inclusion policies. Fleming said he didn't create the video but added it was "getting passed around Louisiana for a reason." Letlow called the move "disgraceful and indefensible."
The underlying issue wasn't entirely fabricated. Letlow had interviewed for the presidency of the University of Louisiana-Monroe in 2020 and stated at the time that she supported DEI. She now opposes it, a shift that mirrors Trump's own push to eliminate DEI across the federal government. But the AI-generated video crossed a line that voters apparently noticed.
Louisiana fits a pattern. Trump has systematically targeted Republican officeholders he views as insufficiently loyal, and he has won far more of those fights than he has lost. Kentucky Representative Thomas Massie lost his congressional seat after Trump endorsed against him. Texas Senator John Cornyn was ousted by a Trump-backed challenger. Five Indiana state senators lost reelection bids last month to GOP challengers Trump endorsed.
Trump has made clear he expects loyalty from Republican lawmakers, and the consequences for crossing him are no longer theoretical. Even Marjorie Taylor Greene, once among his most vocal allies, blamed Trump for driving her out of politics after he threatened to endorse a primary challenger. Former ally Nancy Mace faced a Trump-backed opponent in her race for the GOP nomination for governor of South Carolina.
Whether this consolidation of loyalty strengthens the Republican Party or narrows it is a question that divides commentators. What's not debatable is the electoral math: in heavily Republican states and districts, Trump's endorsement is close to a guarantee.
Letlow will face Democrat Jamie Davis, a northeast Louisiana crop farmer who won his party's primary over Navy veteran and business executive Gary Crockett. Both Democrats campaigned on addressing the cost of living and protecting social safety nets.
In a state this red, the general election is a formality. Breitbart noted that Letlow would become Louisiana's first female Republican senator if elected, a milestone in a state that has sent only men to the upper chamber under the GOP banner.
Letlow's personal story adds a dimension that few candidates can match. Her husband, Luke Letlow, won the same congressional seat she now holds but died from COVID-19 complications before he could take office in 2020. Julia Letlow won the special election to fill his seat in 2021 and has held it since. She went from college administrator to congresswoman to likely senator in five years.
The runoff results showed her strength wasn't limited to her home turf. Letlow carried six of the 13 parishes Fleming formerly represented in the U.S. House, winning across geography, from rural north Louisiana to the New Orleans area in the southeast, including Caddo Parish, home to Shreveport.
Voter Barbara Dufrene, 67, of Marrero, Louisiana, captured the dynamic plainly. She said she knew little about Letlow but was counting on Trump to lower her healthcare costs and strengthen her social safety net. Her reasoning, as the Washington Times reported: "Trump's lady all the way. I always vote whatever Trump wants."
That's not a complicated political philosophy. But in Louisiana, and increasingly across the Republican map, it's the one that wins elections.
The broader friction between Trump and certain corners of the GOP establishment over campaign priorities hasn't disappeared. But the lesson from Louisiana is hard to argue with: when Trump picks a side, the other side loses.
Bill Cassidy cast his impeachment vote on principle and paid for it at the ballot box. Julia Letlow pledged to work "in lockstep with Trump" and is headed to the Senate. Republican voters have made their preference clear, and the party's incumbents would do well to take notes.
