He's destroying their chances of staying in power. Even at his most mentally feeble, St. Ronnie wasn't putting kids in cages, wasn't distancing our allies, wasn't encouraging violence and racism, wasn't kow-towing to our enemies - the list goes on and on. And now the economy is going sour.
The PTB in the GOP may be evil - but they're not stupid. They see the same polls we do, where Dems are polling better than Trump. They know he's not re-electable - and if he were re-elected, they'd be facing four more years of having to put out the dumpster fires he ignites every single day.
The first week of Trump's "pResidency" was spent trying to defend his ludicrous comments about his inauguration crowd. Since then, they've had to defend Russian collusion, porn star payoffs, taking Putin's word over our own intelligence agencies, emoluments, and the endless lies - and so much more.
Republicans like to play offense - and they've been forced to play defense on a daily basis - and they know it's only going to get worse. Eventually all of the investigations into Trump and his family are going to bear fruit - which means even MORE disasters that have to be defended.
I think the Repubs have given up on the WH, and will be focusing on congressional and senate races in hopes of rendering the next Dem president as politically weak as possible.
They've got what they wanted from Trump - two SC judges and other judges, weakening of environmental legislation that hurts corporate profits, a huge tax cut for the wealthy, etc. But they paid a high price for it by having to continually protect a "pResident" who is destroying their 'brand' every time he opens his mouth. At this point, he's just not worth it anymore.