This is simply not true. Do it like the guys who hunt bail jumpers: 1. Post a bond against "junk" accusations of being an illegal. 2. Give a reward for all illegals found? The U.S. would be cleared of illegals VERY quickly.
How do you determine if the "illegals" are actually illegals.
The same way the identity of bail jumpers is confirmed.
This is why people who hunt bail jumpers have to post large bonds, which they lose if they get it wrong.
This way, only real illegals get hassled, and, if a mistake is made, restitution is made, too.
It would work. We need some Republicans with enough balls to do it.