No this is a situation where McConnel needs to defend the constitution and our form of govt. by not participating with the corrupt actions of the House Democrats. To hold a senate trial would be an effective endorsement of their utter corruption - regular courts toss cases that are bad cases as a waste of the court's time. McConnel should summarily reject this case and call the House Dems out on their corruption of our govt by not meeting a constitutional bar for impeachment charges but are instead bringing impeachment based purely on political partisanship. If McConnel allowed that kind of trial then he is aiding them in their political partisan driven destruction of our constitution and our form of govt.  All of this is very hypothetical, of course, as the House Dems won't (or can't) even hold a vote on whether to hold a formal impeachment inquiry. Things are many, many miles away from them bringing anything to the senate