The Biden administration has filed a lawsuit against Texas over its new immigration law, SB4, which allows state and local law enforcement to arrest, jail and prosecute migrants who may have entered the U.S. illegally. The Justice Department is seeking a court order to block the enforcement of the law, arguing that it is unconstitutional and violates federal law. The lawsuit is part of a series of legal battles between the Biden administration and Texas over immigration, the 2020 census, the Affordable Care Act, and voter ID laws.