Trump threatens to back primary challenger against Boebert after she campaigns for Massie

President Donald Trump on Saturday criticized Rep. Lauren Boebert, R-Colo., and threatened to back a primary challenger after she campaigned for one of his top Republican rivals.

Trump posted on Truth Social against Boebert, whom he had previously endorsed for reelection, hours after she appeared with Rep. Thomas Massie, R-Ky., one of Trump’s most vocal GOP critics in Congress.

"Is anyone interested in running against Weak Minded Lauren Boebert in Colorado’s Fourth Congressional District?" Trump wrote.

The president faulted Boebert for supporting Massie, whose primary challenger, retired Navy SEAL Ed Gallrein, has Trump’s endorsement.

"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. "Even though I long ago endorsed Boebert, if the right person came along, it would be my Honor to withdraw that Endorsement, and endorse a good and proper alternative."

"Just let me know, or announce your Candidacy, and I will be there for you!" he added.

Boebert initially declined to comment directly on Trump’s post when asked by Fox News, saying she did not want to "elevate" it. She later defended her support for Massie in a post on X.

"Yes, I saw the President’s post. No, I’m not mad or offended," she wrote. "I knew the risks when I agreed to stand by my friend Thomas Massie. I was, and will be, America First, America Always, and MAGA."

When asked about Trump’s post after a campaign rally Saturday in Kentucky, Massie told Fox News it was too late to challenge Boebert because the filing deadline had already passed.

"I think he should be mending fences with these folks, not trying to burn bridges," he added.

Trump has vowed to unseat Massie, who has pushed for the release of government files related to late financier and convicted sex offender Jeffrey Epstein. Massie has also repeatedly criticized Trump on foreign policy issues.

In a separate Truth Social post Saturday, Trump again attacked Massie as a "disloyal" Republican while reiterating his support for Gallrein.

"His name is Thomas Massie, and he is a disloyal, ungracious, and sanctimonious FOOL, who almost never votes for even the best of Republican Values," Trump wrote.

Trump also praised Gallrein as "a true American Patriot" and urged supporters to back him in the Republican primary.

Kentucky’s Republican primary is scheduled for May 19.

Fox News Digital has reached out to Boebert for additional comment.