As I’ve noted before, the GOP establishment is essentially treating Trump as the representative of a third party with whom they have a tactical alliance; he’s not a real Republican, and they aren’t responsible for him. One of the biggest questions in this election is whether the public will accept that narrative.
Trump is getting more outrageous and authoritarian each day. That is an inherent characteristic of his strong man candidacy; once you start down that path, there is no logical place to stop. The more he deviates from democratic norms, the more plausible the establishment’s argument becomes; there will be millions of Clinton voters who are supporting, not her or her platform, but the democratic process against an ineffectual would-be strong man. It is perfectly possible, therefore, that a smashing Clinton win could be accompanied by GOP victories in key House and Senate races, and that Clinton 45 will be confronted by a Congress and an electorate which can reasonably insist that she has no mandate for liberal policy initiatives.