Washington, D.C., is facing its first challenge to gun restrictions within the district in a lawsuit filed seven days after the U.S. Supreme Court struck down a regulation limiting who can get a concealed carry permit in New York state.

The lawsuit filed Thursday in the U.S. District Court of the District of Columbia challenges a restriction that prohibits carrying firearms within the district’s public transit system, known locally as Metro. While the gun owners in the lawsuit acknowledge the city has the right to ban weapons in certain places, they argue it must be done in line with “the nation’s historical tradition,” a new standard created under New York State Rifle & Pistol Association v. Bruen, decided by the high court on June 23.