...of ANY senator that votes against witnesses in the impeachment trial! This isn't a party issue. All evidence must be heard! Making a decision without hearing all of the evidence is irresponsible, and against everything our justice system stands for! You may try to argue that an impeachment proceeding is not related to our justice system, but it is...it is a trial. If the senate is allowed to acquit the President without hearing all of the evidence, what message does that send to lower courts?