This hyperbole only shows ignorance. Trump has stated when illegals come into contact with law enforcement they will get deported, some may have to wait until they serve out their sentence. He has also stated he will institute E-verify, which will limit their ability to work, forcing some to simply return back home. Hopefully he institutes Employer checks again like Bush did, and he wants to do away with Sanctuary Cities like SF.
Cruz has stated pretty much the same thing. Rubio wants to still give them amnesty once it is "proven" to the public that illegal entry and visa overstays are under control.
Trump said those things? Well, then. It must have been Trump's
evil twin who said that he would deport 12 million illegal immigrants in the first two years of his office. Does the REAL Trump think that all 12 million illegal immigrants are going to "come in contact with law enforcement" in the first 2 years of his presidency, or is that his evil twin talking again? Unless he plans on unreasonable search and seizures, which is prohibited under constitutional law, he must assume that all 12 million illegal immigrants are going to be arrested while in the act of some criminal activity (and being "undocumented" is not a criminal activity).
As I said, neither Trump, nor his followers give a rat's ass about the constitution.