Listening to Trump talk about the southern border and Mexico makes it more apparent than any other issue (China and tariffs being a close second) how much the guy literally just says whatever he thinks of to get through the moment with zero forethought, ideology, or long term strategy.
If he's mad at Mexico and immigrants, Mexico has a weak border policy and Mexico sucks.
If he's mad at the American political system and immigrants, Mexico has a strong border policy and Congress won't equal it.
As was blatantly obvious before the election, there is no policy, no *anything* lending coherence to these outbursts. He says whatever will square with, at most, his previous four or five sentences, and then moves on. It's like writing non-canon fan fiction; as soon as that rant is over, it's like nothing that was said ever happened. It's self-contained and has no effect on anything before or after it.
On the plus side, some of the "Never Trump" right-wingers who voted for him anyway are probably starting to recognize how useless all their theories about how he would grow into the office were.
Oh, who are we kidding. They don't reflect on their decisions.