It would certainly make a very interesting case of state's rights. So far, many if not most of the ICE arrests are neither legal nor warranted. They have no specific warrants to act upon, typically no evidence, and appear to be acting from racial profiling rather than correct police procedures. There is no substantial evidence that the people they have kidnapped have done anything to deserve such violation of due process. It also crosses the line of Innocent until proven Guilty, which applies to anyone inside our borders.
I'm not a legal expert. I don't pretend that ICE has no authority at all. However the state AG's have responsibility to see that the law is correctly carried out within their jurisdictions, as do the Governors. To allow kidnapping, incarceration and torture to occur seems beg the question. I strongly suspect there is legal basis for curtailing ICE's abuse of its mandate.
As for my personal approach I would park large vehicles in front of their offices and refuse them access to city streets. I don't know how well that would work but I sure like the image of them caught inside for a change, like when someone chained the gate on them. There is no doubt that they are a menace to the public at large and completely off the leash as it were.
The Judge who issued the finding regarding unauthorized use of National Guard troops might have a few things to say about it, since he addressed the idea that no evidence existed of a need for them. If Congress has abandoned its responsibilities, and DOJ has likewise, it must fall the the states to correct this. I suspect we'll see more legal challenges to ICE in the future along this line.
How would you propose to protect our citizens, and those who have followed correct immigration procedures from such an armed mob?