By Jonathan Stempel (Reuters) -A U.S. appeals court on Friday struck down a rule the Trump administration had adopted following a 2017 Las Vegas mass shooting that banned “bump stocks,” devices that allow people to rapidly fire multiple rounds from semi-automatic guns. In a 13-3 decision, the New Orleans-based 5th U.S. Circuit Court of Appeals said that despite “tremendous” public pressure to impose a ban, it was up to the U.S. Congress rather than the president to take action. While the federal Bureau of Alcohol, Tobacco, Firearms (ATF) and Explosives had interpreted a law banning machineguns…