 The ordinance was criticized as illegal and unconstitutional.A number of residents (landlords, business owners, lawful aliens defined as illegal under the act, and unlawful aliens) filed suit to strike down the law, claiming it violates the Supremacy Clause of the U.S. Constitution as well as the First and Fourteenth Amendments to the Constitution.After a trial and several appeals (including a remand from the Supreme Court), the Third Circuit found the ordinance invalid due to federal preemption.