I really think you are under thinking this.
It's not going to be cheap to just 'round em up and send em back!' Millions if not billions of government $ will have to be poured into catching them all.
Then, after they all leave, the impact on blue collar America will be so big you won't ever see it coming. Americans are lazy, and don't want the jobs the Hispanics do, at least in my experience. Either a) more automation is employed to harvest food, or b) farmers need to pay an obscene amount of money for low skilled labor to get it done to bribe Americans to want to do it. Both options are good, I have no issue with either honestly, but both options are EXPENSIVE. Americans don't want to spend money on food!
The price of food will go up, people will complain, probably more will file for government benefits, and the smaller farms will go under. Then Americans will complain about 'no family only "factory" farms' being left.
The average American willing work 50 hours a week as a milker is a drop kick, generally speaking. There are exceptions to the rule, but very rarely have we found generally good employees willing to do (or even start out) with a low skill, lower end paying job. There is room for movement upward, but Americans think they are entitled to start there, and manual low skilled work is below them. So we prefer to hire Jose, who is willing and happy to start from the bottom and work his way up over joe, who demands $15 an hour and doesn't want to do physical labor, but doesn't have the brain for anything else.
They don't want to go home, but they don't see America as a long term solution usually. It's so insanely hard for them to be legal, and a lot of them just plain are too scared to start the process.
Do you have any idea how much immigrants contribute to social security that they will likely never collect? The legal ones have it collected, and many return home. The illegal ones that make up a SSN also have it pulled from their paychecks, and obviously never collect it. All the taxes from their paychecks?
The idea Mexicans run across the border to collect welfare is quite a fantasy. Many are way too afraid to get sent back or locked up to even attempt that feat, and those that are in legal standing that have fallen on hard times while trying to come here to work deserve it just as much if not more than the Americans that make a career of living off the government, because they are too lazy to take the job I'm stuck offering to Jose.
Trump is downright racist, every time he talks about immigration he just makes himself look like a bigger butt. Mexico is sending us their rapists? Really? A wall is a feasible way to keep out illegals! Really? Good luck trying to find enough American labor that will work for a reasonable amount to make that wall affordable for the government, or just raise taxes and take more money out of the economy for it, while meanwhile the price of pretty much all ag products and most factory goods is skyrocketing too because Jose isn't working here anymore.
Until the whole attitude of American laborer a changes, Jose is here to stay. No longer is getting out of high school and working your way up the ladder at the local factory a "good option." Now you're supposed to rack up 10's of thousands of dollars in student debt before becoming some office job, even though there aren't many of those. That's what we were pushed to do in high school, even though the factory option was better and more realistic for most of us.
I can honestly say I do not like the idea of a single candidate from any party yet, but he Sure doesn't have my vote. I liked the idea of him at first, a good business man running for president - and then he opens his mouth about Hispanic labor.
