When McConnell rejects Trump...

[DFW]

3. They will never turn on Trump. He is very useful to them.

They could pass a bill saying membership in the Republican Party as a pre-requisite to voting, and Trump would sign it.

Besides, Trump can say all the outrageous shit they want to, but don't dare, and they can pretend to roll their eyes, and say, "yeah, OK, THAT was a little over the top." No, it was no such thing, but while his crazy pronouncements might appeal to the MAGA hat crowd in Skokie, it doesn't appeal to the conservative suburban Republican housewives outside of Des Moines or Memphis. He pleases the nut case crowd, and leaves radical extremists like McConnell to look reasonable by comparison. On their own, their politics come off like Idi Amin, so Trump is just the cover they need to keep doin' their thing.