I guess, I’m one of the few that thinks we can send them all back. The 12 million are not all clustered in one place, they are scattered about in manageable clumps, and immigration law enforcement can be increased where they are clumped to whatever level that it needs to be. All that is needed is to systematically find them and deport them. There can be a lot of things done also to encourage self deportation (no welfare benefits, no housing, no jobs, etc.) It may take a couple of years but if there is a will to send these invading parasites back to their homes, it certainly can be done.
You’re right. Ike did it in the 1950s with Operation Wetback. One of the easiest, least noticeable ways to do it would be to check immigration status of each suspicious person whenever that person interacts either with social services or interacts adversely with law enforcement. If that doesn’t pressure illegals to self deport, it will at least deter them from applying for health and welfare benefits and make them very careful to avoid any illegal activity, from speeding all the way up to murder.