The GOP is called the Stupid Party for a reason. Their only principle is to have no principles and their only strategy is preemptive surrender. They did such a good job of replacing the Whigs that they’ve become the Whigs.
They’ll cave; it’s what they do best.
No, what they'll do is "do a deal". That's what "bipartisan" means -- selling out the People to the 'Rats, in return for a few tax breaks for their Business Roundtable clients and bosses.