Neither candidate said it how you're characterizing it here, at all.... and that's the only frame we have.
I cannot confirm if either candidate has discussed this already with the Mexican government but I suspect not, as this would be against the law. If all of that is true then there's no compulsion to accept your framing of it.
It also would not be surprising to me if Tiny D esp would talk a big tuff guy game and say they're going in regardless of what the Mexican govt says but that's definitely speculation.