The Sixth Circuit Court of Appeals placed a hold on a federal ban on bump stocks on Thursday, ruling that the Trump-era regulation may be unconstitutional. A panel of judges on the Sixth Circuit decided 2-1 that former President Donald Trump’s administration likely violated the Constitution when it banned bump stocks in February 2018. Trump issued an executive order banning “all devices that turn legal weapons into machine guns” following a mass shooting in Las Vegas. In response to Trump’s executive order, the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) reinterpreted federal law that generally bans public ownership of machine guns. A machine gun under federal law is defined as any weapon that can automatically fire more than one shot per single pull of the trigger. The ATF reinterpreted the terms “single function of the trigger” and “automatically” to make bump stocks illegal under existing federal law, according to Bloomberg Law. A bump stock is a device that can be used with a semi-automatic rifle to mimic an automatic weapon. Such a device was used in the Las Vegas shooting in which 58 people were murdered.