Graham and McConnell have been leading the Senate GOP’s criticism of the House impeachment proceedings, which has taken place almost entirely behind closed doors since it began in late September.
Republicans have also questioned the legitimacy of the investigation because it was never sanctioned by a House vote or established with bipartisan cooperation on rules to govern the proceedings.
House Democrats defend the secrecy by arguing Republicans are included in the closed-door proceedings, and that opening them to the public would jeopardize witness testimony.
