You have the federal government who has not done it's job for the last 40 years. Now if we suddenly start enforcing the law we have people who never lived in Mexico eligible to be tossed out.
There are people who came here illegally and had (illegal alien) children or came here with small babies. Now these children are grown up never having known or lived in Mexico.
The problem is the 40 years of lax enforcement- so what do we do about that?
BAR them from ever obtaining citizenship, for one thing. No vote, ever. NO path to citizenship. MAYBE a path to legal residency, but I'd make it ex$pen$ive.