A local official (including sworn law enforcement officers) who violates their oath of office can be charged criminally, but not for treason. That's a federal offense. In some jurisdictions it's a misdemeanor. In others it's a felony. No way some Somali politician is going to ask for an indictment of a Somali sheriff. This dude will get away with it unless it's used against him in federal court for violating his citizenship or residency oath.