Trump threatens to pull endorsement of US Representative Lauren Boebert after she campaigns for Massie

WASHINGTON - U.S. President Donald Trump threatened a primary challenge on Saturday against hardline conservative U.S. Representative Lauren Boebert, until now a staunch Trump ally, after she campaigned for maverick Representative Thomas Massie in his Kentucky district.

• "Boebert is campaigning for the Worst 'Republican' Congressman in the History of our Country, Thomas Massie, of the Great Commonwealth of Kentucky, and anybody who can be that dumb deserves a good Primary fight!" Trump wrote on Truth Social.

• Trump has vowed to unseat Massie, a Republican who has defied the president in Congress over major legislation and the Iran war and led his party's drive to release government files on the late financier and convicted sex offender Jeffrey Epstein.

• The president's quest to unseat Massie poses a test for his hold on the Republican Party.

• Trump's social media post came hours after Boebert made campaign appearances for Massie, who faces Trump-endorsed challenger Ed Gallrein, a retired Navy SEAL, in Tuesday's Republican primary in Kentucky.

• "Is anyone interested in running against Weak Minded Lauren Boebert in Colorado's Fourth Congressional District?" Trump posted. "Just let me know, or announce your Candidacy, and I will be there for you!"

(Reporting by David MorganEditing by Rod Nickel)

Copyright Reuters or USA Today Network via Reuters Connect.

This story was originally published May 16, 2026 at 4:29 PM.