I'm not normally a Federalist but I would be reluctant to let the States decide this issue, since they have been increasingly radical about it. I do think illegal immigration law should be enforced but some of the laws the States have tried passing have been a bit over the top. Illegals are still human beings and should not be treated as the enemy, as there are humanitarian concerns involved in a lot of the cases.
Should be interesting to see how the courts weigh in on this.
"I can explain it to you but, I can't understand it for you"