Trump's short list to replace RBG are four women (and he vowed over the weekend to replace Ginsburg with a woman). If anyone else had been president of course that president would replace RBG with a woman, the seat Ginsburg was nominated to replace Sandra Day O'Conner. But Trump is such a sexist asshole norm-shatterer, on Friday night at least, it looked like there was a real possibility he would nominate some white dude.
So I guess there are limits with this guy after all. Or maybe some advisor just grabbed him by the penis and told him how dumb it would be to not pick a woman.