There is no one "GOP", there are factions, and Trump faction is by far the most dominant currently, if he wins the nomination, they will all fall in line as usual, and all the GOP donors will be giving to Trump. If you are looking for the "bottom of the barrel", there is none. The average republican voter is still very much a trump supporter in the Tucker Carlson camp, MGT, Boebert, Matt Gaetz camp than the Mitt Romney or Mcconnell camp.. And those guys will fall in line as they usually do. You saw what happened to Liz Cheney and anyone else who voted against Trump for impeachment? they all lost their republican primaries and are out of congress.