the chemical weapons attack that happened a few days ago, but the u.s. says it's not convinced. it is questioning if russia helped syria carry out this chemical attack from the air field or knew about it and did nothing to stop it. early friday, the u.s. bombed the airfield in retaliation as we have been covering. for years donald trump before he was even president opposed u.s. intervention in syria against the regime and president trump's decision to authorize a cruise missile attack against the airbase marked an abrupt about face. so what was behind it? here is breana keeler. >> reporter: president trump has long said the u.s. should keep to itself. >> i'm not and i don't want to be the president of the world, i'm the president of the united states. >> reporter: that was before his decision to attack syria in response to horrific pictures of a chemical weapons attack on