It is unnecessary to round up all illegal immigrants if four policies are put in place.
First, close the border and prevent all further illegal immigration as well as visa overstays;
Second, verify that all employees are legal through e-verify;
Third, change the anchor baby policy so that babies born in this country to non U.S. citizens do not automatically become citizens;
Four, those who cannot find employment will likely self deport. Any illegal immigrants found by law enforcement should be deported immediately. Those who are able to slip through the cracks and find work can remain as a non citizen for their natural lives. After they decease and with no further illegal immigrants crossing the border, the so called 11 million (a bogus and convenient estimate) will be reduced to a minuscule number.
This approach may take ten to twenty years or more to reach the goal of reducing the number of illegal immigrants in this country but we have already been dealing with this for over 25 years.
cut off the welfare and free schools to illegals