Representative Michael R. Turner, Republican of Ohio, had at times been critical of the president-elect. He told people that he was axed after an edict from Mar-a-Lago.

The president-elect has admonished Republicans to stay united around his ambitious domestic policy plans. But his track record with Congress is one of abrupt turnabouts and last-minute blowups.

President-elect Donald J. Trump has waffled on his preferences for how his party tackles his agenda, adding to the uncertainty for Republicans.

Only one Republican representative has confirmed that he will oppose Mike Johnson’s return as House speaker, but a few other conservatives have remained undecided.

Speaker Mike Johnson narrowly avoided a painful and prolonged fight to keep his post, but his messy victory showed how difficult his job will be in the new all-Republican Congress.

Mike Johnson persuaded enough holdouts on the right to keep his post, but the vote reflected the steep challenge he faces in governing a slim and fractious majority.