Montana Attorney General Austin Knudsen has led 21 other attorneys general from across the country, filing a brief in support of a lawsuit challenging a federal rule banning bump stocks.
Plaintiffs, including the Gun Owners of America, have asked the U.S. Supreme Court to rule that the Bureau of Alcohol, Tobacco, Firearms and Explosives, or ATF, went against federal law and proper procedure when it made a rule that required gun owners to give up or destroy their bump stocks.