Senate Majority Leader John Thune woke to chaos Tuesday. President Trump had just endorsed Ken Paxton in Texas's GOP Senate runoff, a move that upended the upper chamber's delicate power dynamics and left Republican leadership scrambling to contain fallout from a decision no one saw coming.
The endorsement landed as Trump moved through the second week of what allies describe as a GOP revenge tour. In Louisiana, Sen. Bill Cassidy fell short of the runoff entirely. In Kentucky, Trump-backed Ed Gallrein defeated Rep. Thomas Massie, whom the president had publicly ridiculed. The message was unmistakable: loyalty matters, and Trump punishes defection.
The Paxton call created an immediate problem for Thune. Texas Sen. John Cornyn, who had expected at minimum White House neutrality, now faces a May 26 runoff abandoned by Trump. Sen. Thom Tillis already defected after announcing his retirement in July 2025 following clashes with the president. Cassidy voted with Democrats to advance Iran war powers debate on Wednesday. Three senators Trump can no longer threaten, three votes Thune cannot reliably count on.
Republicans openly questioned the decision. "I don't understand. He is an ethically challenged individual," Sen. Susan Collins said of Paxton. Sen. Lisa Murkowski called herself "supremely disappointed."
The move immediately reshapes Texas general election math. Democratic nominee James Talarico began shattering fundraising records the moment Paxton took the stage. Sen. Lindsey Graham calculated the GOP now faces a race "three times more expensive" to hold. One Thune ally summed it bluntly: "Republicans may keep Texas, but you broke it, you buy it. MAGA Inc. just became Texas Inc."
Trump's frustration with the Senate runs deeper than a single endorsement. The president has grown disgusted with chamber rules that constrain his agenda, particularly the filibuster Republicans refuse to abolish. The Senate parliamentarian has become a personal antagonist. Then came the ballroom security funding that ate at GOP nerves. Thune's public skepticism Tuesday about a 1.76 billion dollar Department of Justice anti-weaponization fund may have been the final spark.
A Trump confidante laid out the calculation plainly: "He's done with the Senate bullshit and Thune and all of them. They can't deliver." The Cornyn gamble had been worth considering, the adviser said, only because of negotiations around the SAVE Act. When that effort collapsed, Trump saw no reason to back a senator who could not deliver. Weekend polling showed Paxton winning statewide. That was enough.
Thune now faces five months of must-pass legislation with a president sick of compromise. Trump demands funding for ICE and Border Patrol by June 1. Section 702 of the Foreign Intelligence Surveillance Act expires June 12. The farm bill deadline is September 30. Republicans need 60 votes for housing reform and cryptocurrency legislation neither party can easily block. A third reconciliation package lingers in discussion.
The Senate leader has built his career on the assumption that Trump's power flows from the fear of consequences. That theory faces its first serious test with lawmakers who have already lost elections or see defeat coming. Fear works when alternatives remain. Thune is about to discover what happens when it does not.
Author James Rodriguez: "Trump just learned he can wound a senator without killing his career, and that may change how he negotiates the rest of his agenda."
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