 O'Brien said the Teamsters are not beholden to anyone or any party. A local law enforcement member with direct knowledge of Saturday's assassination attempt against Trump told CBS News there were three government snipers inside the building that the shooter was on. CBS News' Anna Schechter has more detail on what happened there. Two officers who came for backup tried to get onto the roof and were unsuccessful. State police started rushing to the scene, but by that time a Secret Service sniper had already killed Crooks.