It depends on the place, many cities and states have rules that prevent local police from helping ICE. I'm not saying that police don't need reform because I think that's what the whole 'defund the police' movement is really about, but to say that all police support ICE is inaccurate - otherwise sanctuary cities simply wouldn't be allowed to exist. Now, there aren't nearly as many sanctuary cities as I'd like - and more states would do well to follow the example of states like Oregon, Colorado, Minnesota, etc.

That's another topic entirely, though.