Mike Johnson is fighting for his political life, again. The Louisiana Republican’s hold on the House speaker’s gavel and his position as second in line to the presidency will be tested Friday when a new Congress convenes and House Republicans weigh whether to reelect him to the post. The challenge, as always, is that Johnson will need almost every Republican vote to win. Johnson has a singular asset in his favor: President-elect Donald Trump endorsed him for speaker in a social media post at the start of the week. But it’s uncertain whether Trump’s blessing will be enough to persuade far-right Republicans who have at times grown frustrated with Johnson’s leadership and who are prone to demand concessions when their votes become essential. Johnson, 52, ascended to the speakership in October 2023 almost by accident after Republicans struggled to replace Kevin McCarthy following the unprecedented removal of the California Republican from the job. Several contenders tried and failed before Republicans settled on Johnson, who is well liked across the conference. But Johnson’s handling of major funding fights, including passage of aid to Ukraine last spring and, most recently, a short-term spending bill, has turned at least a few allies into detractors. With Republicans holding a narrow 220-215 majority in the House, it would take only two GOP lawmakers voting for other candidates to deny Johnson a majority for the speakership, forcing more rounds of voting. Here’s what to know about how the House elects a speaker: No House without a speaker Electing a speaker is the first order of business for the House after a new session of Congress begins at noon. It’s a vote that members take even before being sworn into office. The House cannot organize until it has a speaker because that person effectively serves as the House’s presiding officer and the institution’s administrative head. The House can elect a new speaker at any time if the person occupying that role dies, resigns or is removed from office. The speakership has been vacant only 13 times in U.S. history, according to the nonpartisan Congressional Research Service. No speaker had ever been removed until eight Republicans joined with Democrats to oust McCarthy. Barring those instances, a speaker is normally elected at the start of a new Congress and serves in the job for the full two-year session. The House clerk presides over the speaker’s election. Lawmakers call out the name of their choice for speaker from the floor, a rare and time-consuming roll call that heightens the drama on the floor. Members often liven up the proceedings by shouting or standing when casting their vote. Who can be nominated? Any name can be called out from the House floor. While it has been the tradition for the speaker to be a member of the House, it is not required. In past years, Democratic President Joe Biden, Trump and even a senator, Republican Rand Paul of Kentucky, have received votes for House speaker. None received the majority of the vote. And generally, a party’s official nominee for speaker is who ends up with the gavel. Republicans chose Johnson as their nominee for speaker in a closed-door vote in November. A week later, Democrats unanimously chose Rep. Hakeem Jeffries, D-N.Y., to remain their leader despite the party’s electoral losses. Lawmakers are not obligated to vote for their party’s nominated candidate. And that is why the process can quickly get messy. […]