WASHINGTON – Conservative firebrand Rep. Marjorie Taylor Greene, R-Ga., said on Wednesday she’s calling up a vote next week to oust House Speaker Mike Johnson, R-La., setting up a high-stakes clash inside her own party and where Democrats are vowing to help avoid another lengthy vacancy in the job that is second in line of succession to the presidency.

Greene’s move is unlikely to succeed but still is certain to roil internal GOP tension as she continues to target Johnson, the most powerful elected Republican in the country.

Johnson has been defiant in the face of the existential threat to his speakership, saying he has no intention of resigning from his post as a vast majority of his conference backs him. House Democrats on Tuesday promised to kill any effort from Greene to oust him from his speakership.

Greene, a second-term Georgia lawmaker, initially filed her motion that can lead to the removal of a House speaker in March. After weeks of threats, she said on Wednesday that she’ll move next week to force a floor vote.

The coming showdown has the potential to plunge the House into chaos once again after the lower chamber has already seen the ouster of its last GOP speaker, former Rep. Kevin McCarthy. Finding a replacement for the California Republican took three weeks amid significant GOP infighting, with former President Donald Trump demonstrating his power over the party by making public statements that undercut support for one of the leading candidates.

Another potential leadership crisis has raised significant concerns among Republicans about how it would reflect on the party in a critical election year. It’s also not clear who could succeed Johnson if the speakership were to be rendered vacant, but eyes would immediately turn to those who sought the job last year, including House Majority Leader Steve Scalise, R-La., House Judiciary Committee Chair Jim Jordan, R-Ohio, and House Majority Whip Tom Emmer, R-Minn.

While Greene appeared to be a lone dissenter at first, fellow conservative hardliner Rep. Thomas Massie, R-Ky., joined her effort in mid-April, calling on Johnson to resign or else face a vote of no confidence on the House floor. Rep. Paul Gosar, R-Ariz., became Greene’s third public supporter a few days later.

Greene’s call to force a vote to oust Johnson comes after the House passed a set of long-awaited foreign aid bills funding key U.S. allies including Ukraine and Israel.

Conservatives repeatedly pushed Johnson to tie strict GOP-backed border and immigration policy changes to any foreign aid package. But with a Democratic-controlled Senate and White House, such a maneuver would have killed any chance of Congress passing foreign aid, which advocates described as essential to national security.

Johnson long dithered on the issue under intense pressure from conservatives but the speaker made a remarkable change of attitude, particularly with funding Ukraine.

“My philosophy is you do the right thing and you let the chips fall where they may,” Johnson told reporters in April. He said that he if had operated out of fear he wouldn’t be able to do his job.

“History judges us and what we do,” the Louisiana Republican added. “This is a critical time right now, a critical time on the world stage. I can make a selfish decision and do something that’s different but I’m doing here what I believe to be the right thing.”

Democratic support may not help Johnson

Johnson also added a personal reason for why he’s supportive of aiding Ukraine, noting his son is set to begin at the U.S. Naval Academy in the fall.

“This is a live fire exercise for me, as it is so many American families,” the House speaker said. “This is not a game. This is not a joke. We can’t play politics with this.”

House Republicans control the lower chamber with just a razor-thin majority and a one-vote margin, meaning with Greene, Massie and Gosar calling for Johnson’s removal, that would be enough votes — assuming Democrats joined them — to topple the speaker. The conservative Republicans have hinted there are other members willing to force Johnson out.

Just one aggrieved lawmaker can initiate the process to remove a speaker thanks to a decision by McCarthy to change the lower chamber’s rules. In his own pursuit of the speakership early last year, McCarthy agreed to allow for a vote on his ouster if it was called for by just a single member.

Johnson’s allies pleaded with the speaker in April to change the rules to beat back Greene’s effort and any other possible future removal threats. But Johnson has announced the House will continue to operate under it’s existing set of rules.

Johnson and his fellow Republican leaders are almost certain to try to dismiss Greene’s push, and Democrats will support such a move.

“We will vote to table Rep. Marjorie Taylor Greene’s Motion to Vacate the Chair. If she invokes the motion, it will not succeed,” House Democratic leaders said in a joint statement on Tuesday morning.

But it’s not clear whether Johnson could stay on as speaker with the help of Democrats. Conservatives and several other House Republicans have doubts publicly and privately at the prospects of a Republican speaker staying in power with Democratic support.

This is a breaking story and will be updated with developments.

This article originally appeared on USA TODAY: MTG to force vote on House Speaker Mike Johnson’s job