Helpful piece from Prof. Steve Vladeck on Supremacy Clause Immunity amid questions of whether states can prosecute ICE or other federal agents for violating state law for their conduct during immigration raids, protests, etc.
For our purposes, recall that any defendant officer would attempt to remove under § 1442. He then would have to show a "colorable" Supremacy Clause Immunity defense to keep the case in federal court.
The piece alludes to the difficulty of suing federal officers for damages for constitutional violations. That is the topic for Part II of the course sequence--Civil Rights next semester.