You won’t get any argument from me. AZ should indict him. They have a Federal AG there like every state does.
If Arizona can decide it is a sovereign state with rights to make the laws it sees fit, then we might see some action.
If Arizona decides it is the sixth borough of New York City, then Fuggedaboutit.
Look for the jerk who sold the guns to become States evidence. The ONLY chance he has of saving his behind is to admit it, take a plea bargain and testify, then show his retarded face on Oprah.
(and then sue for a bazillion bucks)