Trump's Republican administration alleges the ban violates the Constitution's Second Amendment right to bear arms.
Adams says the NYPD has removed over 20,000 illegal firearms from the streets since his administration began in 2022.
Wisconsin has a number of firearm-related laws in effect that limit access to children and individuals with a history of violence.
The latest discovery was made in a school inside the Percy Sutton Educational Complex in Harlem on Friday morning, where authorities say they found a 16-year-old with a fully-loaded .38 caliber in his backpack.
A 17-year-old was shot in the leg on Thursday at a playground across the street from Ralph R McKee Career and Technical Education High School on Staten Island, police say.
The 11-year-old -- who is related to the victims -- "gave us a story at first that just didn't add up," Minden Police Chief Jared McIver told ABC News.