The Republican lawmakers argued that the order, which Trump issued on his first day in office, correctly interpreted the citizenship clause of the Constitution, which states that “all persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States.”

A group of House Republicans filed a brief Monday using case law from the 1600s to defend President Trump's efforts to end birthright citizenship. The big picture: The GOP lawmakers cited an English case from 150 years before the U.