that are leading to more questions at every turn. this image of air force one leaving las vegas flying behind the mandalay bay hotel. bump stocks like this, they use the recoil of the rifle to help pull the trigger much faster. it s almost like a machine gun. i ve never heard of bump stocks until this tragedy. so i have no problem banning those. ban manufacturing or possession of accessories that accelerate a semiautomatic rifle s rate of fire. normally anything connected to gun control is a lost cause in congress, but this time several republicans say they are willing to consider this one. they ve never even heard of the device before. and they re in congress. so many of them are open to a conversation. yeah, there are going to be some hearings. does america fromhave a gun violence problem? we re not going to talk about that today. we begin this hour with breaking news. multiple senior law enforcement officials tell nbc news stephen