Since the November elections, some state legislatures have introduced Tea Party–inspired legislation concerning guns and law enforcement that would, in effect, nullify federal law. This is a bad idea, because it could lead to even more extreme measures — sanctuary cities that declare themselves de facto exempt from federal immigration law and forbid their law-enforcement officers from cooperating with ICE officials; or state laws that do not allow federal officials to ensure that citizens are in compliance with federal immigration laws. And then we would have veritable anarchy.