House Republicans will have a small margin in the chamber next year. Speaker Mike Johnson has warned Trump, who is still pulling from the GOP's ranks.

The president-elect is testing the loyalty of Republican in Congress, leaving even his close allies nervous about the unpredictability and upheaval to come.

Complicating the matter for senators is the Trump campaign’s decision to not engage, so far, in the traditional transition process, having declined to sign agreements with the federal government that would launch FBI background checks of nominees, among other standard steps before confirmation hearings.