In effect, immigration law is what Trump says it is. The use of his phony disaster at the southern border allows him to make his own laws and rules. For example, his executive orders setting aside most laws and regulations to insure that the right people are being deported causes confusion, not just among migrants but also ICE. To meet the goal of 3,000 arrests a day the protection of the innocent will be secondary to deportation orders. Since we have made it nearly impossible for the accused to defend themselves, lots of innocent people are going to be deported.
After the Trump era, we are going to be bringing back into the US thousands of people who have been illegally deported, workers with valid green cards, spouses of US citizens, even those born in US.