Cornyn Draws Contrast With Massie, Cassidy as He Faces Trump-Backed Paxton

John Cornyn is seeking to distinguish his campaign for reelection to the U.S. Senate from recent high-profile Republican primary battles, arguing his contest against Texas Attorney General Ken Paxton is fundamentally different. President Donald Trump endorsed Paxton on Tuesday, noting Cornyn was "late in backing me" in his second run for president.

Cornyn rejected comparisons between his situation and those of Representative Thomas Massie and Senator Bill Cassidy, both Republicans who lost primaries after clashing with Trump. He argued that, unlike them, he has maintained a strong record of supporting the president's agenda.

"I think it's very different from the Cassidy and Massie situation, because I've been a Trump ally," Cornyn said Sunday on NewsNation's The Hill Sunday.

Massie drew Trump's wrath by opposing the Iran war and pushing for greater transparency on the Epstein files, while Cassidy voted to convict Trump in his second impeachment trial following the January 6 attack on the U.S. Capitol.

Cornyn said Trump "got frustrated with the Senate" when he was unable to secure his priorities quickly, describing him as "an impatient guy" who he said was trying to "send a message" with his endorsement of Paxton. Cornyn added that he has backed Trump's agenda while choosing his disagreements on a case-by-case basis.

The Texas lawmaker is competing in a Republican primary runoff on May 26 after neither he nor Paxton secured a majority in the initial March primary, triggering a second round to determine the GOP's nominee for the November election. The winner will face Democratic state Representative James Talarico in the general election. Recent polls and prediction markets suggest Talarico is within striking distance of flipping Texas, a state Democrats haven't carried for statewide office since 1994.

The Republican runoff has emerged as one of the most closely watched contests of the 2026 cycle, pitting Cornyn-a four-term incumbent backed by GOP leadership-against the outspoken Paxton, a Trump-aligned challenger who has embraced a more confrontational political style. Paxton, who supported Trump's efforts to overturn the 2020 election results, has seen his standing in both polling and prediction markets climb significantly since the endorsement.

The race is widely seen as a test of whether Republican voters favor establishment experience or a more insurgent, populist approach, with potential implications for the direction of the party nationally.

Cornyn is attempting to frame his race less as a referendum on loyalty and more as a question of electability, warning that nominating Paxton could put a typically safe Republican Senate seat at risk in the general election.

Still, the contest was significantly reshaped when Trump endorsed Paxton, a move that delivered a major boost to the attorney general and underscored the president's continued influence in GOP primaries.

Support From GOP Leaders

Cornyn has continued to draw support from Republican leaders in Washington, with members of the Senate GOP and establishment-aligned groups backing his bid for reelection. That support reflects concerns among some Republicans that Paxton-who has faced legal and ethical scrutiny-could be a riskier nominee in November.

Senate Majority Leader John Thune, a South Dakota Republican, expressed his disappointment with Trump's endorsement, reiterating his support for Cornyn, whom he called a "principled conservative" while speaking reporters on Tuesday.

Senator Susan Collins, a Maine Republican, said the president picking Paxton left her dismayed, adding, "John Cornyn is an outstanding senator and deserved, in my judgment, the president's support.

Senator Lisa Murkowski, an Alaska Republican, said that she was "supremely disappointed" by Trump's move and feared it put the Texas seat “in jeopardy.”

Senators James Lankford of Oklahoma and Thom Tillis of North Carolina have also publicly backed Cornyn.

Those dynamics have sharpened the stakes of the runoff, which now serves as both a local contest in Texas and a broader proxy fight over the future identity of the Republican Party.

The final days of the race are expected to center on turnout among Republican voters, with both campaigns focusing on mobilizing their respective bases in what is typically a lower-participation runoff. The result could hinge on whether Cornyn's support among more traditional Republicans outweighs Paxton's appeal to highly motivated conservative voters.

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This story was originally published May 24, 2026 at 12:49 PM.