The Right-Wing Dream of ‘Self-Deportation’ | Some conservatives have a grim proposal to make undocumented immigrants leave: Exclude their children from schools.
Strong incentive to leave the country for recent immigrants, and if they stay and eventually legalize their status, they will be uneducated. So it's a win win for conservatives.
There's a little bit of history though: the backlash to a similar measure in California resulted in the Republican party becoming a permanent minority in the state legislature.