President Donald Trump on Saturday threatened to withdraw his endorsement from Rep. Lauren Boebert, R-Colo., a staunch MAGA loyalist and conservative firebrand, over her continued support for Rep. Thomas Massie, R-Ky.—potentially jettisoning one of his longtime supporters as ousting Massie has emerged as one of the president’s top political priorities.

Boebert is standing by Rep. Thomas Massie, R-Ky., who is facing a primary challenge from a Trump-backed candidate.

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In a post on Truth Social on Saturday, Trump asked if anyone was interested in running against Boebert, whom he called “Weak Minded,” later insulting her by insisting “anybody who can be that dumb deserves a good Primary fight!”

Trump also called her a “carpetbagger” for running for reelection in a more conservative new district in 2024, and said she was competing with Massie for “Worst ‘Republican’ Congressman in the History of our Country.”