There are 3 facts that Republicans have been trying, or are going to continue to hide from the American electorate at all costs:
1. Trump isn't a wealthy, self-made man. He runs spectacular con games using inherited and laundered money.
2. Trump isn't an intelligent, shrewd strategist. He's a bumbling incoherent ignoramus who needs to be handled by others.
3. Trump is a criminal, and numerous Republicans are inextricably entangled in his crimes.
Many Republicans may hate Trump, but they understand that their mythic house of cards comes tumbling down when these truths are exposed. There's no way, for example - they compel Trump to testify in impeachment trail, and they will continue to break laws to keep Trump's finances hidden.
The Republican party is 100% linked to Trump. It is the party of Trump now. They thought they could control him as a useful idiot, but his popularity within the Republican party means he controls them. The time to get rid of Trump was when he joined the primaries or when he won the primaries. Oh sure, they would have been breaking their own rules, but so what. What a few party rules compared to all the laws they are now breaking. It's possible that they would have lost very many votes by going against the will of their internal electorate. I've seen nothing to suggest that anything will turn a die-hard Republican voter against the Republican party and vote for a Democrat. But again, I think they saw Trump as candidate as a potential positive. Trump was a outsider with no political experience. Perhaps they believed Trump when he said he would get the best people as adviser's. Perhaps they thought Trump would actually listen to advice. Boy, were they wrong. But they cannot reverse direction now without get obliterated at the polls. They only thing that can save the Republican party is Republican voters not voting for them. They need to get obliterated even without reversing course, so that they can reverse course. I just don't see this happening though.