--- title: "Letlow wins Louisiana GOP Senate runoff, favored to take Cassidy's seat" description: "US Representative Julia Letlow won the Republican nomination for Louisiana's open US Senate seat on Saturday, defeating state Treasurer John Fleming in a runoff. With the backing of President Donald Trump and in a heavily Republican state, she is now the strong favorite to win the seat in November." category: "Politics" category_url: https://newsparlor.com/category/politics author: "Lucas Silva" published: 2026-06-28T02:08:00.000Z updated: 2026-06-28T02:08:00.000Z canonical: https://newsparlor.com/article/louisiana-letlow-senate-gop-runoff tags: ["louisiana", "us-senate", "julia-letlow", "john-fleming", "bill-cassidy", "2026-midterms"] --- # Letlow wins Louisiana GOP Senate runoff, favored to take Cassidy's seat US Representative Julia Letlow won the Republican nomination for Louisiana's open US Senate seat on Saturday, defeating state Treasurer John Fleming in a runoff. With the backing of President Donald Trump and in a heavily Republican state, she is now the strong favorite to win the seat in November. Representative Julia Letlow won Louisiana's Republican Senate runoff on Saturday, defeating state Treasurer John Fleming to claim the GOP nomination for the seat currently held by Senator Bill Cassidy, [CNN reported](https://www.cnn.com/2026/06/27/politics/louisiana-senate-republican-runoff-trump-letlow-fleming-cassidy). The runoff was needed after no candidate cleared 50 percent in the May primary, in which Letlow led with about 45 percent to Fleming's 28 percent. ## How the seat came open The contest was set in motion by a striking primary result: Cassidy, the two-term incumbent, finished third in May and was knocked out of the race. Multiple outlets, including [NPR](https://www.npr.org/2026/05/16/nx-s1-5824533/bill-cassidy-lost-louisiana-primary-letlow-trump), tied his defeat largely to his 2021 vote to convict Trump at the former president's impeachment trial following the January 6 Capitol attack — a vote that drew lasting anger from many Louisiana Republicans. Cassidy was the only Republican senator from a Deep South state to vote for conviction. ## Who Julia Letlow is Letlow, who represents Louisiana's Fifth Congressional District, first won her House seat in a 2021 special election held after her husband, Luke Letlow, died of COVID-19 complications in December 2020 — weeks after he had won the seat but before he could take office. She is the first Republican woman elected to represent Louisiana in the US House and sits on the Appropriations and Education committees. ## Trump's role Trump encouraged Letlow to run and endorsed her, and he made a final public push on her behalf before the runoff. His support was widely seen as a major advantage in a state he carried with about 60 percent of the vote in 2024. Fleming, a former congressman now serving as state treasurer, also campaigned as a Trump ally but could not overcome her edge with the president's explicit backing. ## What's next Letlow advances to the November general election, where she is favored against the Democratic nominee. Louisiana has not elected a Democrat to the US Senate since Mary Landrieu in 2008, and independent analysts rate the seat as safely Republican. The result also underscored a broader pattern in the party: Cassidy became one of the few sitting senators in recent memory to lose renomination, a marker of the continued weight of loyalty to Trump within the GOP.