Ummm... there are 51 GOP senators.
The Republicans will get three to five Democrat votes to confirm the POTUS, Trump choice for the next Associate Supreme Court Justice. No Democrat that is in serious re-election trouble will give up his or her seat to Chuck Schumer, or anyone else. They will vote “yes” to save their seats. This game is over.
If McCain resigns, that is a good thing because the voters of Arizona right now are without one senator that can vote. If it is Cindy McCain and she votes for Trumps Supreme Court nominee, that is OK!!!