FILE - Police run toward the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip in Las Vegas on Oct. 1, 2017. The Supreme Court has struck down a Trump-era ban on bump stocks, a gun accessory that allows semiautomatic weapons to fire rapidly like machine guns. They were used in the deadliest mass shooting in modern U.S. history. The high court Friday found the Trump administration did not follow federal law when it reversed course and banned bump stocks after a gunman in Las Vegas attacked a country music festival with assault rifles in 2017. (AP Photo/John Locher, File)