President-elect Donald Trump offered House Speaker Mike Johnson (R-LA) a lifeline on Monday by endorsing his speakership just days before the 119th Congress is set to convene and elect its next leader. However, it may not be enough for some of Johnson’s staunchest opponents.

Before lawmakers can be sworn in Friday, they must vote to elect a speaker to preside over the chamber. On that day, Republicans will have a 219-215 majority, meaning Johnson can only afford to lose one party member’s support if all members are present and vote. Any more than that, and his speakership is in jeopardy.