The GOP nominated Trump as their Presidential candidate....to, I might add, what is likely their ever-lasting regret.  They had many, many choices and, decided The Donald was the "best."  They're paying the price for that choice.

I think it is rather unfair to present Trump as representative of all Republicans...obviously, he isn't.  More and more Party leaders, down-ballot candidate and "rank-and-file" party members are saying "enough is enough. I tried to the party loyalist and support the GOP nominee, but, sorry, I simply can't continue to do that."  The task, now, is not to "save Donald Trump", but to save the House and Senate majorities the Party now holds....and, with Trump at the top of ballot and now running a "scorched earth" campaign against those candidates who have withdrawn their support, that won't be easy.  

In fact, the GOP, after November 8th, will have to reassess itself and decide what values it wishes to represent.  That will be an interesting process.