About 30% to 40% of illegals come from visa overstays. So they will continue to come without a system to track, monitor, and deport visa overstays plus those who will come without a secure Mexican border. And these “newcomers” will have a 2 and 1/2 year window to apply for Z-visas with their fraudulent documents. And then the 12 to 20 million illegals already here will be given legalized status and will start bringing in their spouses, children, and parents under chain migration, which will add at least another 25 to 40 million more legal immigrants. By that time, who needs a fence? We won’t even be the same country any more.
Of course you are right. I know we have to stop the flow from everywhere.