Federal law restricts the ownership of machine guns but not semiautomatic weapons. In 2018, under the Trump administration, the Bureau of Alcohol, Tobacco, Firearms and Explosives adopted a formal rule classifying a semiautomatic rifle equipped with a bump stock as a machine gun. Last week, the U.S. Supreme Court held that the ATF exceeded its statutory authority in adopting that rule in the case Garland v. Cargill, 602 U.S. __ (2024).