House Speaker Mike Johnson will need Democratic votes to save his job after a third Republican lawmaker came forward on Friday and backed a motion to oust him.

Far-right Rep. Paul Gosar (R-Ariz.) announced he had co-sponsored a motion to vacate Johnson’s speakership after the House teed up a Saturday vote on a $95 billion foreign aid package for Ukraine, Israel and Taiwan.

“[R]ather than spending the resources to secure our southern border and combating the invasion of 11 million illegals and despite repeated promises there would be no additional money going to Ukraine without first securing our border, the United States House of Representatives, under the direction of the Speaker, is on the verge of sending another $61 billion to further draw America into an endless and purposeless war in Ukraine,” Gosar said in a statement.

“I have added my name in support of the motion to vacate the Speaker. Our border cannot be an afterthought. We need a Speaker who puts America first rather than bending to the reckless demands of the warmongers, neo-cons and the military industrial complex making billions from a costly and endless war half a world away,” he added.

Republicans hold a three-vote majority in the House, meaning Democrats would need to step in to oppose disgruntled conservatives should they move ahead on a vote to strip the gavel from Johnson (R-La.).

Moderate House Democrats like Tom Suozzi of New York and Jared Moskowitz of Florida have already pledged to defend Johnson from his own party when that moment comes.

“We will have a conversation about how to deal with any hypothetical motion to vacate, which at this point hasn’t been noticed,” House Minority Leader Hakeem Jeffries (D-NY) told reporters Friday.

“The prerequisite to the conversation is to make sure that the national security legislation in totality is passed by the House of Representatives,” he added.

“My philosophy is you do the right thing and you let the chips fall where they may,” Johnson told the press Wednesday. “If I operated out of fear of a motion to vacate, I would never be able to do my job.”

Far-right Rep. Marjorie Taylor Greene (R-Ga.) lodged the motion to oust Johnson after the House passed the second half of its fiscal year 2024 spending bills last month, arguing that the speaker had done nothing to address conservatives’ concerns about the US border crisis and was prolonging Ukraine’s war with Russia.

“I have support on this from others in my conference,” Greene claimed after announcing the motion March 22, without naming names. “I’m not introducing this to throw the House into chaos.”

Despite Johnson holding private meetings with Greene, the Georgia congresswoman has dangled the ouster threat over his head as an unprivileged motion, meaning she would have to change its designation to put it on the House floor for a vote.

On Tuesday, Rep. Thomas Massie (R-Ky.) co-sponsored the motion to vacate after calling on Johnson to resign during a closed-door Republican conference meeting on Capitol Hill.

Johnson told reporters that he will not resign, saying it was “an absurd notion that someone would bring a vacate motion when we are simply here trying to do our jobs.”

Massie made his move, he told The Post and other reporters later that day, to “avoid the situation where he gets vacated from the floor” after the foreign aid is expected to pass on Saturday.

House Democrats rallied to Johnson both in committee and on the floor to boost the foreign aid package by wide margins — but over objections from dozens of Republicans, including many in the conservative Freedom Caucus.

“The Hastert Rule, if you remember, says that if a majority of the majority doesn’t support it, you don’t bring it to the floor,” Massie also said, referring to former Speaker of the House Dennis Hastert.

“The Johnson Rule is if 80% of Democrats don’t support it, you don’t bring it to the floor. And that’s problematic,” he added. “If Mike Johnson insists on getting to the endpoint that Joe Biden and [Senate Majority Leader] Chuck Schumer want. … I think he’s already over-drafted on his political capital.”

“Moscow Marjorie Taylor Greene, Massie and Gosar are quite a group,” Jeffries shot back on Friday, adding that their machinations against Johnson “will play some role” in Democratic caucus deliberations over rescuing the speaker from his own party.

Massie, Gosar and other hardline Republicans have repeatedly accused Johnson of breaking his promise to secure the US border before passing funding for foreign military and humanitarian aid, which has only deepened the migrant crisis.

That has accompanied a shocking surge in crimes, drug overdose deaths and human trafficking, according to Gosar.

“My congressional district in Arizona, ground zero for the invasion, is getting pummeled by the surge of lawbreakers,” he said in his Friday statement. “Congress cannot continue to turn a blind eye to the consequence of Biden’s disastrous open border policies, nor can it idly wait for Biden to halt this invasion through executive fiat.”

Eight House Republicans led by Rep. Matt Gaetz (R-Fla.) joined with 208 Democrats to oust former House Speaker Kevin McCarthy (R-Calif.) last October, plunging the chamber into chaos for weeks until the GOP conference unanimously elected Johnson as their next speaker.

Gaetz at the time suggested that he filed the motion to vacate McCarthy for passing a government funding deal that included a secret side provision to aid Ukraine.

McCarthy last week accused Gaetz of making the move “to stop an ethics complaint because he slept with a 17-year-old.”

“Did he do it? I don’t know,” the ex-speaker said.

Greene, Massie and Gosar were not among the other seven Republicans who voted to remove McCarthy.