“One step at a time.
Secure the border.
Cut illegal aliens off from freebies.
Punish employers who knowingly hire illegal aliens.”
IMO if these step are taken and rigorously enforced there would be a stampede of illegals returning to their home countries. Deportation of the remainder will then be much more manageable.
Besides the ones that would be left would probably fall into one of two groups - criminals and entrepreneurs. We MIGHT want to keep the second group...