President Donald Trump’s influence over Republican primaries faces another major test in Louisiana, where GOP voters are choosing between Rep. Julia Letlow and state Treasurer John Fleming in a Senate runoff that could help shape the party’s midterm direction.
The race is for the Republican nomination to replace Sen. Bill Cassidy, who was denied another term after years of tension with Trump and the GOP base. Cassidy’s political standing among many Louisiana Republicans never fully recovered after he voted to convict Trump during the president’s second impeachment trial. His loss in the first round showed how difficult it remains for Republicans to survive primaries after breaking with Trump on major loyalty tests.
Letlow, who has Trump’s endorsement, finished first in the initial Republican primary with about 45% of the vote. Fleming followed with roughly 28%, while Cassidy finished third with just under 25%. Because no candidate crossed 50%, Letlow and Fleming advanced to Saturday’s runoff.
A Letlow victory would strengthen Trump’s record of reshaping the Senate GOP by helping elect loyal allies and removing Republicans he views as insufficiently supportive. A Fleming win, however, would show that Trump’s endorsement is powerful but not always decisive, especially when another candidate can claim conservative credentials and ties to the president’s movement.
TRENDING TODAY
Letlow has made Trump’s support central to her campaign. She also has backing from Louisiana Gov. Jeff Landry, a close Trump ally, and other senior Republican figures. Since entering Congress in 2021, Letlow has represented Louisiana’s 5th District after the death of her husband, Luke Letlow, who had won the seat but died before taking office.
Fleming is also running as a conservative aligned with Trump’s agenda. He previously served in Congress and later worked in Trump’s first administration. His campaign has argued that he is the more consistent conservative in the race, creating an unusual situation where Trump’s endorsed candidate is facing a rival who is also trying to appeal to the MAGA base.
That dynamic makes the Louisiana runoff more than a local contest. It is a measure of how Republican voters respond when Trump chooses one candidate but another candidate presents himself as ideologically similar. In deeply conservative states, the fight is often less about whether candidates support Trump and more about who voters believe will fight hardest for his agenda.
The winner of the Republican runoff will become the clear favorite in the general election. Louisiana is a solidly red state, and the Democratic runoff between farmer Jamie Davis and Navy veteran Gary Crockett is unlikely to change the overall Republican advantage. Still, the Senate race matters nationally because every seat affects the balance of power in Washington.
For Trump, Senate primaries are about more than personal loyalty. If Republicans keep or expand their Senate majority, Trump will need reliable senators to support his nominees, legislation and oversight battles. Replacing critics or unpredictable Republicans with stronger allies could make his final two years in office easier.
The race also fits into a broader pattern across this year’s Republican primaries. Trump-backed candidates have won several major contests, including races where incumbents or establishment-backed candidates were defeated. But his record has not been perfect. A few endorsement setbacks have shown that local networks, wealthy self-funders, conservative organizations and candidate quality can still complicate the president’s influence.
Louisiana’s runoff will therefore be watched closely by Republican strategists, donors and candidates in other states. If Letlow wins comfortably, it will reinforce the message that Trump’s endorsement remains the most valuable asset in GOP primaries. If Fleming pulls off an upset, it could encourage other conservatives to challenge Trump-backed candidates by arguing that they are more authentic or more experienced.
For voters in Louisiana, the campaign has centered on conservative identity, loyalty, experience and who can best represent the state in the Senate. For national Republicans, the larger question is whether the party’s future Senate caucus will be shaped primarily by Trump’s choices or by a wider conservative coalition that sometimes moves independently of him.
The answer could influence how candidates run in other red-state primaries. Many Republicans will still seek Trump’s endorsement, but the Louisiana race may show whether that endorsement alone is enough or whether candidates must also build strong local support, raise money and survive attacks from other parts of the conservative movement.
Saturday’s runoff is not expected to determine which party controls the seat in November, but it may help determine what kind of Republican Party Louisiana sends to Washington.
Why It Matters
The Louisiana runoff is a test of Trump’s continuing control over Republican nominations. For GOP voters, it is a choice between two conservative candidates with different claims to Trump-aligned leadership. For Washington, the outcome could affect how loyal and unified the Senate Republican conference becomes during Trump’s final years in office. For Democrats, the race shows how difficult it may be to compete for Senate seats in deeply red states.
What Comes Next
Louisiana voters will decide whether Letlow or Fleming becomes the Republican Senate nominee. The winner will enter the general election as the strong favorite against the Democratic nominee. National Republicans will watch the result closely as a signal of whether Trump’s endorsement remains decisive or whether GOP voters are willing to choose another conservative even when the president has picked a side.
Trump has publicly endorsed Julia Letlow in the Louisiana Senate runoff, making the race another test of his influence in Republican primaries.
Highly Respected America First Congresswoman, Julia Letlow, of the wonderful State of Louisiana, is a Great Star, has been from the very beginning, and only gets better! Julia is running for the United States Senate in Louisiana, a place I love and WON BIG, six times, including… pic.twitter.com/JKwH3nYTIT
— Commentary Donald J. Trump Truth Social Posts On X (@TrumpTruthOnX) June 26, 2026
