BREAKING — Published May 19, 2026 · By Roe Baynes · 3 Min Read
For full background on the Texas Senate race read our complete analysis here → Texas Senate Race 2026: The Lone Star Showdown
President Donald Trump ended months of suspense on Tuesday, May 19, officially endorsing Texas Attorney General Ken Paxton over four-term incumbent Senator John Cornyn in the May 26 Republican Senate runoff — dealing a crushing blow to Cornyn, to Senate Majority Leader John Thune, and to the Washington establishment that had spent over a year lobbying Trump to back the incumbent.
Trump’s Words — Unfiltered
In a lengthy Truth Social post, Trump called Paxton “a true MAGA Warrior who has ALWAYS delivered for Texas” and praised his support for terminating the Senate filibuster to pass the SAVE Act. On Cornyn, Trump was pointed but measured: “John Cornyn is a good man, and I worked well with him, but he was not supportive of me when times were tough. John was very late in backing me in what turned out to be a Historic Run for the Republican Nomination.” Trump closed with his signature flourish: “Ken Paxton has my Complete and Total Endorsement to be the next United States Senator from the Great State of Texas — KEN PAXTON WILL NEVER LET YOU DOWN!”
The Backstory — A “Genius Move” and a Betrayal
Trump was gravitating toward endorsing Cornyn as recently as last week — but grew frustrated after his intentions leaked to the press. Then Paxton made what White House officials privately called a “genius move” — announcing he would consider dropping out of the race entirely if Senate Republicans lifted the filibuster to pass the SAVE Act. The gambit froze the Cornyn endorsement and repositioned Paxton as the candidate most willing to fight for Trump’s signature legislative priority. Even Cornyn’s humiliating proposal to rename a Texas highway after Trump wasn’t enough to prove his loyalty. Loyalty, it turns out, has a longer memory than a highway sign.
Thune’s Reaction — Stone-Faced and Seething
The Senate Republican establishment did not take the news well — and that may be an understatement. Senate Majority Leader John Thune, who had lobbied Trump hard for months to back Cornyn, was stone-faced when he walked out of his Capitol office into a lunch meeting with fellow Republicans. Asked for his reaction, Thune said somberly: “It’s his decision.” Sen. Roger Wicker remained completely silent with his head bowed as reporters peppered him with questions. Sen. Susan Collins said she “doesn’t understand” why Trump endorsed the “ethically challenged” Paxton, calling Cornyn “an outstanding senator” who deserved the president’s support. Sen. Lisa Murkowski was blunt: “I am supremely disappointed. How does that help strengthen the president’s hand when we lose a state like Texas?”
Steve Bannon put it more colorfully: “This is as much a vote of no confidence in John Thune as it is a vote of confidence in Ken Paxton.” A Republican operative who spoke anonymously put it even more bluntly, saying Trump “saw the way the winds were blowing, but the f— you to Thune is an added bonus.”
The Implications — Runoff, General, and the Filibuster
Based on pre-endorsement polling from Texas Public Opinion Research, a Trump endorsement of Paxton was projected to push his runoff lead to 55%-35% over Cornyn — effectively ending the race before a single runoff vote is cast. Early voting began Monday and is already underway, meaning tens of thousands of ballots had already been submitted before Trump’s post hit Truth Social Tuesday morning.
The general election picture, however, is where Republican anxiety is loudest. Sen. Lindsey Graham acknowledged that Trump’s endorsement of Paxton could make the race “three times more expensive” for Republicans. Democrat James Talarico — who has already raised over $27 million and is polling ahead of both Cornyn and Paxton in head-to-head matchups — wasted no time responding. “For decades, John Cornyn and Ken Paxton have embodied a broken politics that enriches wealthy donors while costs skyrocket for the rest of us,” Talarico said, framing the race not as left vs. right but as the people vs. the political machine.
The filibuster question now moves to center stage. Trump’s Truth Social endorsement explicitly cited Paxton’s commitment to terminating the filibuster to pass the SAVE Act — and Trump made clear he believes Democrats will eliminate it themselves the moment they regain power, using it to add Washington D.C. and Puerto Rico as states and pack the Supreme Court with up to 21 justices. Whether Paxton can actually deliver on that promise once in the Senate remains to be seen — but the endorsement makes it the defining legislative battle of this race and potentially of the entire 2026 midterm cycle.
The Bottom Line
Trump’s endorsement of Paxton one week before the May 26 runoff is effectively the ballgame. Cornyn now faces the same fate as Bill Cassidy — a career Washington Republican undone not by Democrats but by the voters of his own party who no longer recognize the party he helped build. The establishment lobbied hard, spent nearly $125 million, and lost anyway. The runoff is May 26. The general election is November 3. And Texas — a state Republicans have not lost at the statewide level since 1994 — is suddenly in play in a way nobody in Washington is comfortable with.
Watch this one closely.
For full background on both candidates, the primary results, polling, and general election analysis read: Texas Senate Race 2026: The Lone Star Showdown and Texas Senate Race 2026: The Rundown
