Ken Paxton, Texas Attorney General, has defeated incumbent U.S. Senator John Cornyn in the Republican primary runoff for the Senate nomination, marking a historic moment as the first time a Texas Republican senator has lost renomination.

Paxton's victory is largely attributed to Donald Trump's endorsement, demonstrating the former president's continued influence within the Republican Party. Following his win, Paxton described Trump's support as the "most powerful force in politics," highlighting the enduring significance of Trump's backing for Republican candidates.
John Cornyn, who has represented Texas in the U.S. Senate since 2002, was considered a representative of the Republican establishment. The 72-year-old senator had served four terms and was formerly a member of the Republican Senate leadership. His defeat is being interpreted as a clear signal of the changing power dynamics within the party.
Ken Paxton, in contrast, embodies the Trump-loyal wing of the Republican Party. As Texas Attorney General since 2015, he has built a profile through his uncompromising stance on conservative legal issues. However, his tenure has also been overshadowed by controversies and scandals, which apparently have not damaged his popularity among the Republican base.
The primary was viewed as an important test of Trump's political influence. The result shows that the former president remains capable of toppling established Republican politicians when he grants his support to a challenger. This underscores the ongoing division between the traditional Republican establishment and the populist wing of the party.
Trump congratulated both candidates after the election through social media. He praised Paxton's "tremendous win" while also acknowledging Cornyn's "strong and powerful race" and his "truly great career." Trump emphasized that Cornyn would "remain my friend for a long time to come."
For Texas Republicans, the result represents a significant shift to the right. Paxton is considered substantially more conservative than Cornyn and is expected to pursue a more uncompromising political line. This could have implications for legislation in the U.S. Senate should he win the November election.
In November, Paxton will face Democratic candidate James Talarico. Although Texas is traditionally considered a safe Republican state, Paxton's controversial background could provide opportunities for Democrats. Talarico has already built a base of supporters and could benefit from potential reservations among moderate voters regarding Paxton.
The election is also being watched nationally with great interest, as it serves as an indicator of Trump's continued influence on the Republican Party. A Paxton victory would further strengthen Trump's position and could encourage other established Republicans to align themselves more closely with the former president.
The primary outcome reflects broader trends within the Republican Party, where Trump-endorsed candidates have increasingly challenged establishment figures. This pattern has been observed in various states, suggesting a fundamental realignment within the party's power structure.
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Ken Paxton, Texas Attorney General, has defeated incumbent U.
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Timeline
Al Jazeera · May 27, 2026 at 09:03 AM
Ken Paxton wins Texas primary election: Results and key takeaways
The Guardian · May 27, 2026 at 11:32 AM
First Thing: Trump-backed Ken Paxton ousts John Cornyn in Texas primary
Globe and Mail · May 27, 2026 at 11:43 AM
Trump-endorsed Paxton topples Cornyn in Texas Senate race
The Guardian · May 27, 2026 at 11:44 AM
Paxton hails Trump’s endorsement as ‘most powerful force in politics’ after Texas runoff win – US politics live