I think John S.Bolton is dead on but the system is coming-apart and is in the hands of the enemy and the drug money is in place to buy any political person.

Now that the cat is out of the bag, many municipalities have huge incentive to try enacting ordinances of such kind.
There is no principle that says municipalities must accept having illegals dumped on to them at the expense of the net taxpayer.
There are all sorts of ways they can approach the problem, the hiring of school residency validity checkers is becoming continually more popular.
The entire resources of the hostile Mexican government would not suffice to go after all the places, which have each their own policy towards the same end.
The supreme court would have to give out some piece of unspeakably depraved shystering, such as that all is illegal which particularly offends the Mexican government, regarding privileges for illegals.
I have no doubt that their clerks are even now under instruction , twisting their minds to find some way to make it a federal crime to prevent an illegal from getting privilege.
After all, how else is racial-ethnic warfare and dictatorship to be set up?
How can officialdom and its professoriate be expected to give up their dreams of total power, and the chance to smash civilization and its selfish bourgeoisie?