I don't know myself, I heard one pundit say if a wall is built, they will come up the California coast.
Also saw an article which I can find now, as a general comment, the writer said the old "Yanqui go home" mentality could come back... but, Mexico, Honduras, Panama, a lot of Latin America is in crisis now, high crime. Argentina is making it's immigration laws harder and deporting people.
Back in the day, Nixon went to Latin America and had a rough time.
http://www.latinamericanstudies.org/nixon.htmHe had a tough time in Caracas, Venezuela but was welcomed in Bogota, Colombia.