Well, that would tend to stop the flow......if we know one thing, taxing things tends to stop the flow. Obviously, I am being cynical about his intentions, but if we suddenly suggested to our poor that they cross over into Mexico and demand driver's licenses, health benefits and quasi citizenship, they wouldn't like it either. Hhhhhmmmmm, now there's an idea! See how they like it!
They'd end up in police station showers "attached" to old field telephones until they promised to leave and never come back.
Ship 10 million of our Urban poor that would get their attention and the UN would be on our side!