A reader makes a good point:
It is amazing how Hazleton could pass a “sanctuary city” law if it wished, without apparently running afoul of the constitution. It could even do what New Haven did, and offer ID cards and services specifically to illegals. The only local laws which ever get struck down as “unconstitutional” are the ones which would actually reinforce what is the formal Federal law. Local laws which *contradict* Federal law never seem to draw the attention of the judges.
Nor, I would add, do they draw the attention of the ACLU, which I believe has sued every single jurisdiction which has had the temerity to reinforce federal law. A look at the different paths taken by Hazleton and New Haven is here.