WASHINGTON — Sen. Bill Cassidy of Louisiana was knocked out of his Republican primary on Saturday, delivering another emphatic victory for President Donald Trump and underscoring the continuing power of Trump-backed challenges inside the GOP.
According to results reported by The Associated Press, Cassidy fell short of advancing to the runoff in Louisiana’s Senate race, finishing behind Rep. Julia Letlow and state Treasurer John Fleming. Letlow led the field with about 45 percent of the vote, while Fleming followed with roughly 28 percent. Cassidy, who had been one of the most prominent Republican skeptics of Trump in the Senate, trailed with just under 25 percent.
Because no candidate cleared the 50 percent threshold required for an outright win, Letlow and Fleming will move on to a runoff next month to determine the Republican nominee for the U.S. Senate seat. Cassidy’s defeat marked a rare and significant loss for an incumbent Republican senator seeking renomination, and a notable political defeat for a lawmaker who had remained a frequent target of Trump and his allies.
A long-running feud ends in defeat
Cassidy’s relationship with Trump has been strained for years, but it deteriorated sharply after Cassidy voted to convict Trump during the former president’s impeachment trial. That decision made Cassidy one of the most visible Republican critics of Trump in Congress and placed him squarely in the crosshairs of the party’s Trump-aligned base.
Trump repeatedly pressed voters to reject Cassidy, calling him disloyal and framing the Louisiana race as an opportunity to punish a Republican who had crossed him. The result capped a years-long effort by Trump and his political operation to defeat the senator, a campaign that ultimately succeeded in a state that has become increasingly aligned with the former president’s brand of politics.
For Trump, the primary outcome is more than a personal victory. It is also a demonstration of how firmly his endorsement, and his opposition, continue to shape Republican nomination contests even when he is not on the ballot.
Letlow and Fleming advance to runoff
The race now shifts to a head-to-head runoff between Letlow and Fleming, each appealing to different corners of Louisiana’s Republican electorate. Letlow entered the contest as the Trump-endorsed candidate and emerged from the first round with the strongest showing. Fleming, a former congressman and Trump White House aide, positioned himself as a more overtly MAGA-aligned conservative and drew support from grassroots activists eager to defeat Cassidy.
Political observers say the runoff is likely to be closely watched as a test of whether Trump’s preferred candidate can hold off a challenger with deep conservative credentials and strong anti-establishment appeal. Early polling ahead of the runoff suggests a competitive race, though Letlow’s first-round advantage gives her a notable edge heading into the next phase.
The runoff also extends what has already been an expensive and bruising primary campaign. Both candidates are expected to intensify their efforts in the coming weeks, with national Republican figures and outside groups likely to weigh in as the contest becomes a proxy battle over the direction of the party.
Closed-primary change may have shaped the race
This year’s Senate primary in Louisiana was conducted under a newly closed system, a shift that required voters to be registered Republicans in order to participate in the GOP contest. It was the first time in more than five decades that Louisiana used a closed primary to select a U.S. senator.
That change was widely seen as unfavorable to Cassidy, who had hoped to rely on a broader coalition of voters, including independents and more moderate Republicans. With the electorate narrowed to party loyalists, Cassidy faced a more difficult path, especially in a political environment where Trump remains highly influential among Republican voters.
Analysts had warned that the closed-primary setup could increase the likelihood of an anti-Cassidy outcome, particularly given the former president’s vocal push to remove him from office. Saturday’s result appeared to validate those concerns.
Another sign of Trump’s grip on the GOP
The Louisiana result arrives as Trump continues to exert extraordinary control over Republican nomination fights nationwide. The former president has made loyalty one of the defining tests in GOP politics, and candidates who break with him frequently face fierce backlash from the party’s core voters.
Cassidy’s defeat adds to a growing list of examples in which Trump has used his influence to settle political scores and reshape the Republican field. For party strategists, the Louisiana race is a reminder that even sitting senators can be vulnerable if they fall out of favor with Trump and run in a primary dominated by his supporters.
At the same time, the outcome also highlights the shifting character of the modern Republican Party. What was once considered a safe incumbent advantage no longer guarantees survival when the political environment is defined by ideological purity tests, loyalty to Trump, and grassroots anger at lawmakers seen as insufficiently aligned with the MAGA movement.
Cassidy’s political future remains uncertain
Cassidy’s defeat closes the door, at least for now, on his Senate career, though it does not necessarily mark the end of his political life. The Louisiana Republican has spent years building a reputation as a pragmatic conservative and a physician-politician with broad policy interests, particularly in health care. But in the current Republican climate, that résumé was not enough to overcome the weight of Trump’s opposition.
For supporters of the senator, the result will likely be seen as evidence that party loyalty has eclipsed governing experience and policy credentials. For Trump’s allies, it will be hailed as proof that the former president still commands the loyalty of Republican voters and can turn primary contests into instruments of political revenge.
The runoff between Letlow and Fleming will now determine who carries the GOP banner into the general election. But Cassidy’s elimination from the race has already delivered the larger political message: in the Trump era, defying the party’s dominant figure can come with a steep price.