PLANO, Texas (AP) — Texas Attorney General Ken Paxton won the Republican nomination for U.S. Senate on May 26, 2026, defeating incumbent Senator John Cornyn. Paxton's victory, supported by an endorsement from former President Donald Trump, marks Cornyn as the first Republican senator from Texas to lose the party's nomination for reelection since he was first elected in 2002.
Paxton credited Trump during his victory speech, stating, "President Trump is the leader of our party, and his endorsement is the most powerful force in politics." Trump's influence was evident as he had previously endorsed challengers to Republican lawmakers in other states, reinforcing his hold on primary voters.
Democrats are optimistic about their nominee, state Representative James Talarico, who may have a chance to win a statewide race against Paxton. Cornyn, in his concession speech, expressed support for Paxton in the general election, despite having been critical of Trump in the past.
The primary runoff followed a costly campaign, with Cornyn leading Paxton in the initial primary but failing to secure a majority. Cornyn's campaign spent approximately $109 million on advertising, focusing on Paxton's ethical controversies, including a 2023 impeachment trial where he was acquitted of corruption charges.
Trump's endorsement of Paxton came after early voting began, with Trump stating that Paxton is a fighter who knows how to win. Voter opinions varied, with some supporting Paxton due to Trump's backing, while others viewed Cornyn as the more viable candidate against Talarico.
Cornyn's loss highlights the shifting dynamics within the Republican Party, particularly regarding loyalty to Trump. Some GOP strategists have expressed concerns that Paxton's nomination could lead to increased costs in the general election campaign.