In Chamber of Commerce v. Whiting, the U.S. Supreme Court held that an Arizona statute, whereby the state could revoke the business licenses of Arizona businesses that employed illegal aliens, was not preempted by federal immigration laws. Federal law bars local laws regulating immigration except that states are permitted to enact and enforce laws related to licensing. Sanctioning employers through licensing laws therefore did not violate this federal preemption principle. In addition to federal immigration law compliance obligations, employers will also need to comply with any future local rules.