Local police could protect the people by enforcing the law. A clearly illegal ICE vehicle is being protected by Chicago police.

We need leaders willing to fight for the people rather that protecting the magastapo.

True - the Minnesota police could, in theory, issue a traffic citation to that vehicle. Then, in due course, it would go through the normal process for traffic violations and end up in traffic court. Where a judge could in theory revoke the vehicle registration or issue some other ordinary traffic violation enforcement sanction. Which ICE could probably either ignore under the Supremacy Clause, or appeal under the Supremacy Clause. Because there's no way a traffic court judge is equipped to weigh a constitutional argument over the Supremacy Clause.

This would result in a rather significant allocation of police resources to a relatively useless and meaningless endeavor that has virtually zero chance of having any effect - even a trivial one - on ICE and its operations.

Which is why they don't do it. Those police are there to do things that are somewhat more important than writing traffic citations, and there's no reason whatsoever to go down that road with ICE car by car.

What the county could do is seek an injunction in federal court against ICE prohibiting them from obscuring or removing license plates. That would square up the issue fairly well, and in a court that could grant that relief. If they haven't done that, the most likely reason is that they don't think they have much of a case. Again, the Supremacy Clause gives the federal government a lot of leeway to ignore state laws in the conduct of their federal activities.

https://archive.is/Ifsdm