At this point I'll take Trump and many of the people that were/are around him being ineligible for public office, elected or appointed.
16 other Republican votes required if McConnell prefers not to ever deal with him again.
I see the following possible gets: Shelby, Inhofe, Collins, Murkowski, Burr, Blunt, Toomey, Portman, Sasse, Cassidy, Romney. That list either is retiring, voted to convict, or both. It leaves McConnell five short, and I don't know where he would get them from. That said, I probably would have told you the same thing about Nixon in May of 1974. so things can change in a hurry.