Originally posted by: Nines
Court outcomes regarding the federal govt. witholding of criminal justice grant funds from states / cities who don't cooperate with ICE immigration efforts have largely favored the cities to date ( most, not all). There are executive branch powers and laws already on the books, however, that do apply for cities that harbor or protect known criminals from prosecution / or withhold info on this classification of undocumented migrants. It's likely why the majority of the current efforts are focusing on this 'criminal' group.
https://www.americanimmigrationcouncil.org/research/sanctuary-policies-overview
(the above is a somewhat left- leaning organization publication.. for those who care )
Ultimately, like a lot of other current ongoing processes, Congress needs to enact laws with specificity to address this issue. Like a lot of other current conflicts, this one will also likely end up in front of SCOTUS. But it's a mixed review of inputs and legs to stand on for this fight concerning the true criminal elements among the migrants; the administration has lawful accommodations on their side here for known bad guys but the laws need clarified / enacted by Congress / SCOTUS to be barb-free. That'll take time that somebody doesn't have the wherewithall to provide, probably.
"I'm on the run, the highway is my home.."..2,3,4
You described perfectly what is illegal and that's why all of the "criminal" investigations of sanctuary cities will end up the same way as Trump's legal cases to overturn the 2020 election.
Sanctuary Cities by their definition do not volunteer immigration intelligence to the Federal government. That's not synonymous with "withholding immigration intelligence from the Federal government ". There is no law that requires local and state police to enforce federal laws....and vice versa. That's why the FBI doesn't enforce speeding tickets in your neighborhood. It's called separation of powers, some cities do volunteer immigration intelligence to the Feds. That's fine. It's not required - hence the word volunteer.
now, if police or local officials actively obstruct a Federal investigation you have a case. Nothing of that sort has been reported to my knowledge. Feel free to refute that statement with evidence if it exists.