President Donald Trump took to Truth Social on Sunday to rally Texas Republicans behind Attorney General Ken Paxton, sharpening his case against incumbent Sen. John Cornyn just days before Tuesday's GOP Senate runoff. The post marked Trump's second public push for Paxton in a matter of days, and his most pointed attack yet on the man he wants replaced.
Trump praised Paxton's record and framed the race as a test of loyalty to the America First movement. In his Truth Social message, the president left little room for ambiguity about where he stands, or what he expects from Texas voters heading to the polls.
The May 26 runoff was triggered after neither Paxton nor Cornyn cleared the 50-percent threshold in the March 3 primary. Cornyn took roughly 42 percent that night; Paxton followed at about 40.5 percent. Millions in campaign spending have since poured into the contest, turning a once-sleepy intraparty affair into one of the most closely watched Republican primaries of the cycle.
Trump's Sunday post carried his signature directness. He reminded Texas Republicans of Paxton's record as attorney general and, more pointedly, of Paxton's willingness to stand with him during legal and political battles that many other Republicans avoided.
"TEXAS, REMEMBER! Ken Paxton was a GREAT Attorney General, probably the best in the Country. He was also very loyal to your favorite President, ME, as the Dumocrats played their ultimate game of Weaponization, and failed, BADLY!"
That framing, loyalty under fire, has been the backbone of Trump's endorsement from the start. When he first backed Paxton, Trump called him a "true MAGA Warrior" and an "America First Patriot," as National Review reported. Even then, polling showed Paxton edging ahead of Cornyn at 45.5 percent to 42.3 percent, a lead that preceded the endorsement.
Trump's criticism of Cornyn has been consistent but notably measured in tone. He has called Cornyn "a good man" while making clear that good manners don't count for much when the chips are down.
"Ken's opponent was VERY disloyal to me, as President, and didn't fight hard enough for the desperately needed SAVE AMERICA ACT, VOTER I.D., PROOF OF CITIZENSHIP, NO MAIL-IN BALLOTS."
Trump also cited Cornyn's late backing of his presidential campaign and past criticism of the border wall plan, AP News reported, framing the senator's record as one of fair-weather support rather than genuine conviction.
Paxton didn't leave the weekend messaging to Trump alone. Appearing on Newsmax's "Wake Up America Weekend," the attorney general drew a sharp contrast with Cornyn on the issues that matter most to Republican primary voters: immigration, border security, and support for the president's agenda.
"Now that we've defined John and people understand what he's about, we finally had enough money to get a message out about what he actually believes, which is that he fought the border wall."
Paxton went further, calling Cornyn "pro-amnesty" and claiming the senator "didn't want Donald Trump to be reelected." Those are strong charges, and Paxton has not publicly detailed the specific votes or statements he relies on to support them. But the framing fits a pattern Republican primary voters have seen before: incumbents who talk right at home but govern from the center in Washington.
Trump's endorsement of Paxton over Cornyn follows a familiar playbook. The president has increasingly used his political capital to challenge longtime Republican officeholders he views as insufficiently aligned with his agenda, and voters have responded.
Cornyn has pushed back, pointing to his long Senate tenure and influence within the Republican conference. The senator has argued that his record speaks for itself, telling the Washington Examiner that he "worked closely with President Trump through both of his Presidential terms and voted with him more than 99% of the time."
That 99-percent figure is designed to blunt the disloyalty charge. But in a Republican primary shaped by Trump's personal endorsement, voting percentages may matter less than the moments that defined the relationship. Trump has made clear that Cornyn's late support during the 2016 campaign, and what he sees as insufficient fight on election integrity, outweigh years of reliable floor votes.
Paxton, for his part, has framed the choice in blunter terms. He told Breitbart that Cornyn has served more than 42 years in public office and cannot name a single accomplishment worth keeping him around for. "He has had his time, he has not performed, and it's just time for a change," Paxton said.
The Texas runoff fits into a larger trend of Trump-endorsed challengers testing, and often defeating, Republican incumbents who broke with the president on key votes or failed to back him when it counted.
Louisiana voters recently ousted Sen. Bill Cassidy in a Republican primary after Cassidy voted to convict Trump during his second impeachment trial. That race served as an early signal that GOP voters were willing to remove sitting senators who crossed the president, even senators with otherwise conservative records.
The same dynamic played out at the state level. In Indiana, Trump-backed challengers swept GOP primaries and unseated incumbent state senators who had blocked redistricting efforts. The pattern is unmistakable: Republican voters are taking their cues from the president, and incumbents who ignored that reality paid for it at the ballot box.
Cornyn is betting that Texas is different, that his seniority, his relationships, and his voting record will outweigh a Truth Social post and a Newsmax interview. He may be right. Texas is a big state with an expensive media market, and Cornyn has spent decades building a political operation there.
But the March primary results suggest the ground has shifted. A sitting senator who can't crack 42 percent in a primary is a senator with a problem, regardless of who endorses whom.
The May 26 runoff will determine the Republican nominee who goes on to face Democrat James Talarico in the general election. In deep-red Texas, the primary winner is the overwhelming favorite to hold the seat.
That makes Tuesday's vote a consequential test, not just of Paxton versus Cornyn, but of whether Trump's endorsement can unseat a three-term senator in the nation's second-largest state. If Paxton wins, it will be the most significant Trump-driven primary defeat of an incumbent Republican senator since the MAGA movement reshaped the party. If Cornyn survives, it will be the clearest evidence yet that Trump's grip on primary outcomes has limits.
Either way, the race has already revealed something important. Cornyn's 99-percent voting record with Trump wasn't enough to avoid a bruising challenge. In today's Republican Party, loyalty isn't measured by floor votes alone. It's measured by whether you stood up when standing up was hard.
Texas voters will have the final word on Tuesday. The president has made his preference unmistakable. The question now is whether the Republican base agrees, or whether seniority still counts for something in a party that increasingly prizes conviction over tenure.
