National Security Commissioner Renato Sales said in a TV interview on Tuesday that Mexico is in talks with the United States on whether to allow U.S. federal air marshals to travel with Taser stun guns on cross-border flights with U.S. airlines, Sales’ comments come the day after Reuters exclusively revealed that Mexico and the United States were looking into an agreement that could allow armed U.S. federal air marshals to be deployed on commercial cross-border flights.