The remittances that Mexicans send back home are a major source of income to Mexico - and certain communities in particular.  As the Mexican economy suffers, those who live there will become increasingly desperate to get out and earn a living.  Beware the "unintended consequences", when you haven't really thought things through.

And what about "illegals" who have children that are legitimate American citizens?  Are the children to be left behind in the U.S. to fend for themselves?

And who's going to do all the scut-work that is presently being done by the "illegals"?  Sure as hell, the "deplorables" aren't about to start picking lettuce, cleaning hotel toilets, and trimming chicken parts for less-than-minimum wage!