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.

Even before taking office, Trump is challenging the Senate , in particular, to dare defy him over the nominations of Matt Gaetz , Robert F. Kennedy Jr. and other controversial choices for his Cabinet and administration positions .

The Florida Republican’s departure effectively ends the House Ethics Committee’s investigation of allegations that include sexual misconduct and illicit drug use.

Republicans have officially won a full trifecta of power in Washington, D.C., following GOP victories in several key U.S. House contests.

Plus, Sen. John Thune will be the next Senate majority leader, while President-elect Donald Trump continues to build his next staff.