State Border Defense Act

This bill authorizes Arizona, California, New Mexico, and Texas to have state and local law enforcement officers enforce federal laws prohibiting unlawful entry into the U.S. (specifically sections 271-280 of the Immigration and Nationality Act). It also allows these states to build barriers on federal land along the U.S.-Mexico border, provided the barriers don't hinder border patrol operations or block lawful commerce. State prosecutors gain authority to file federal immigration cases in U.S. District Court for violations covered under the bill. The bill explicitly states it overrides the 2012 Supreme Court ruling in *Arizona v. United States* regarding similar state laws. It directly affects law enforcement in those four border states and federal immigration enforcement procedures.