Rep. Thomas Massie (R-Ky.) on Tuesday announced he will co-sponsor a resolution to oust Speaker Mike Johnson (R-La.) from the top job.

Massie told his colleagues during a closed-door conference meeting that he will co-sponsor the motion to vacate resolution filed by Rep. Marjorie Taylor Greene (R-Ga.) late last month, according to three GOP lawmakers in the room, becoming the first lawmaker to publicly join Greene's effort.

Massie confirmed his announcement in a post on the social media site X.

"I just told Mike Johnson in conference that I’m cosponsoring the Motion to Vacate that was introduced by @RepMTG. He should pre-announce his resignation (as Boehner did), so we can pick a new Speaker without ever being without a GOP Speaker," he wrote.

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