Donald Trump endorsed Ken Paxton, Texas's attorney general, over incumbent Senator John Cornyn in the Republican primary runoff. The endorsement came one week before voting closed in the costly and divisive Texas GOP Senate race.

Trump's backing of Paxton represents a significant split within Republican ranks. Cornyn, who has served in the Senate since 2003, faced a primary challenge from the more conservative Paxton. The endorsement signals Trump's preference for a candidate positioned further right than the establishment-backed incumbent.

This move carries real weight in Texas Republican politics. Trump remains highly influential among GOP primary voters, particularly in conservative strongholds. His endorsement could shift momentum in a race where both candidates were competing for the same voter base. Cornyn had been considered the frontrunner as the sitting senator with institutional advantages and major donor backing. Paxton brought the energy of a candidate with higher name recognition among Trump supporters and conservative activists.

The timing of Trump's endorsement, just days before the runoff vote, maximized its impact. Trump had previously refrained from taking sides in earlier primary stages, leaving the door open for this late intervention. The decision reflected Trump's ongoing role as a kingmaker within the Republican Party and his ability to energize base voters even outside the 2024 presidential race.

For Cornyn, the endorsement represented a threat to his political survival. While he had compiled a conservative voting record in the Senate, Trump's backing of Paxton highlighted perceived differences on certain issues or simply Trump's preference for candidates who aligned more closely with his political brand.

The Texas Senate primary runoff emerged as one of the most expensive and contentious GOP primary races of the cycle, attracting national attention and significant campaign spending from both sides. Trump's endorsement injected fresh drama into the final week of voting, forcing both candidates to recalibrate their closing arguments to conservative primary voters