If you look at the numbers, U.S. population would be flat to declining without immigration.
We probably don't actually have enough people to "put back to work".
And if unemployment is actually in the less than 4% range, what are they not going to do to go do something else?
What will the economic fallout be from deporting.. say 4 million people? What will the economic fallout be from deporting.. say 4 million people?