Outside of the speaker’s role effectively running the House, they are also in the line of succession for president – raising questions about what happens if there’s no one in the position that’s second in line for the presidency after the vice president.

The Senate president pro tempore is third in line. Sen. Patty Murray was elected to that role Tuesday, making the Democrat from Washington the first woman to hold the position.
— Read on www.cnn.com/2023/01/04/politics/what-happens-without-house-speaker/index.html