Trump threatens to withdraw endorsement of Rep. Lauren Boebert in Colorado

President Donald Trump on Saturday sharply criticized the president’s longtime ally, Rep. Lauren Boebert (R-Colo.), and threatened to endorse a rival who is campaigning on behalf of one of his top Republican rivals.

Rep. Thomas Massie, R-Ky., one of Trump’s most vocal GOP critics in Congress. Just hours after campaigning with , he attacked Truth Social against Boebert, whom he had previously supported for re-election.

“Anyone want to run against Weak-Minded Lauren Boebert in Colorado’s Fourth Congressional District?” Trump wrote.

The president criticized Boebert for supporting Massie, whose primary opponent, retired Navy SEAL Ed Gallrein, has Trump’s support.

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“Boebert is campaigning for Thomas Massie, the Worst ‘Republican’ Congressman in Our Country’s History, from the Great Commonwealth of Kentucky, and anyone who can be that stupid deserves a good Primary challenge!” Trump wrote. “While I supported Boebert long ago, if the right person comes forward, it would be my honor to withdraw this endorsement and support a good and appropriate alternative.”

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

Boebert declined to comment directly on Trump’s post when questioned by Fox News, saying she did not want to “elevate” it. He later defended his support for Massie in a post on X.

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Rep. Lauren Boebert defended her support for Rep. Thomas Massie following criticism from President Donald Trump. (Tom Williams/CQ-Roll Call, Inc via Getty Images; Salwan Georges/Bloomberg via Getty Images)

“Yes, I saw the President’s post. No, I am not angry or upset,” he wrote. “I knew the risks when I agreed to stand by my friend Thomas Massie. I was and will remain America First, America Always and MAGA.”

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

“I think he should make amends with these people instead of trying to burn bridges,” he added.

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President Donald Trump points to Rep. Thomas Massie (R-Ky.), who voted against Trump and Republicans during his time in the House. (Win McNamee/Getty Images; Nathan Posner/Anadolu/Getty Images)

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

In a separate Truth Social post on 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, discourteous and arrogant IDIOT who almost never votes for even the best of Republican Values,” Trump wrote.

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President Donald Trump arrives to speak at a dinner for members of the administration and law enforcement leaders during National Police Week in the White House Rose Garden on May 11, 2026 in Washington. (Julia Demaree Nikhinson/AP)

Trump also praised Gallrein as a “true American Patriot” and urged his supporters to support him in the Republican primaries.

Republican primary elections in Kentucky will be held on May 19.

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

Fox News’ Jessica Sonkin and Reuters contributed to this report.