skeeter asks:
"What happens if the governor himself signs a law prohibiting LEO's from cooperating with ICE?"
Then it's the job of the president -- who is "higher up" than the governor of ANY state insofar as the "Constitutional law enforcement peckin' order" goes -- to step up to the task, send in the Army, and offer that governor a choice:
1. Enforce federal laws,
or
2. Be physically removed from office immediately.
See... that was easy!
And before you reply, "balderdash", I will say... "Little Rock, 1957".