“Democrats are putting Illegal Alien Criminals over Taxpaying, Law-Abiding Citizens, and they have created dangerous circumstances for EVERYONE involved,” he wrote. “Tragically, two American Citizens have lost their lives as a result of this Democrat ensued chaos.”



The supremacy clause just means federal charges supercede state charges, not that federal officers are immune to state charges. If the federal courts want to bring federal murder charges against the ICE agents they could supercede the state ones, but that doesn’t stop the state officers from arresting the federal ones either until federal charges are brought or for other state crimes. Police have a long history of throwing everything they can possibly think of at someone knowing most of it won’t stick, if they wanted to I’m sure they could come up with a couple dozen state charges with no equivalent federal ones they could use to keep ICE behind state bars pending a federal court date.
No one said immune. It’s a change that can be charged federally, of the state tried they’d take it federal and the state couldn’t charge it as a state charge at that point. So no detention, no arrest and moreover no arrest warrant which you would need for an on duty officer.
If they held a rectal officer on duty all they’d be doing is catching federal obstruction charges and the state leo would get arrested instead.
There’s no magical state bullet for beating the feds, it just doesn’t work that way.