Trump was well on his way to losing this race, but now that more and more of the Republican establishment is coming out against him he has the perfect narrative to explain away his loss:
“I would have won if the GOP hadn’t stabbed me in the back.”
This is why Trump will never drop out. He has to lose and he needs the GOP to be against him by Nov. 8th so he explain that loss as the result of the failures of the party, not his failures.
I fully expect Trump to do everything he can from now until election day to make more Republican leaders come out against him. If he can get Ryan to withdraw his endorsement than he will be happy.
Being beaten by the Republicans will sound so much better to his fans than being beaten by a girl.