Barrasso: Senate GOP can remain impartial on impeachment

As the impeachment trial of President Trump opens, questions persist about how it will be run. In particular, Democrats and Republicans have argued over whether or not to include witness testimony. Sen. John Barrasso, R-Wyo., joins Lisa Desjardins to discuss how he and his GOP colleagues can be impartial while coordinating with the White House and why he supports postponing the witness question.