Mike Johnson's (R-La.) speakership is on the verge of becoming another casualty of bitter division within the Republican Party.

Why it matters: If Johnson is ousted or resigns anytime soon, it will add to the recent trend of GOP speakerships being cut short by hard-right revolts.

• Johnson would join his predecessor former Rep. Kevin McCarthy (R-Calif.) among the shortest-serving speakers in U.S. history.

Context: Republican Rep. Thomas Massie (Ky.) said on Tuesday he would support Rep. Marjorie Taylor Greene's (R-Ga.) effort to oust Johnson through a motion to vacate over plans to bring foreign aid bills to the floor.

• Johnson, the least experienced speaker in over a century, has said he will not resign, and former President Trump, the GOP's de facto leader, has said he stands with the speaker.
• House Republicans released the text of their Ukraine, Israel and Taiwan aid bills on Wednesday.

Zoom out: The same motion to vacate process sunk McCarthy's speakership last year after he angered members of the far-right House Freedom Caucus and other GOP representatives after he relied on Democratic votes to avoid a partial government shutdown.

• Members of the House Freedom Caucus were key in former Speaker John Boehner's (R-Ohio) decision to step down after threatening to use the same vacate mechanism to oust him.
• And while former Rep. Paul Ryan's (R-Wisc.) speakership wasn't cut short by party infighting, he decided not to run for re-election after taxing years of dealing with Trump and his allies.

Between the lines: Johnson resigning or being ousted anytime soon would paralyze the House amid several ongoing international crises.

• After McCarthy was booted, the House went without a permanent speaker for over three weeks. How long it would go without one if Johnson is gone is anyone's guess.

The big picture: Democrats have said they are willing to save Johnson's speakership by opposing a motion to vacate if he meets their terms for the foreign aid bills.

• Adding to the pressure is the Republicans will have a one-vote margin in the House after Friday, as Rep. Mike Gallagher (R-Wis.) is leaving.

Go deeper: Mike Johnson sets up weekend showdown on foreign aid bills