Trump is just the master of getting people to box themselves into a corner. Mexico is going to get fed up with having illegals entering their country and they’ll clamp down tighter on their southern border. That and holding off any aid and trade with them. Once that starts hitting Mexicans in the pocket book, as it has already, there won’t be anybody crossing their southern border.
Not to mention illegals aren’t going to want to wait around for long periods of time in a place that’s worse or no better than where they came from.
Yeah, Mexico cannot wait until PDJT leaves so that things can go back to normal with open borders.