coast. around the world. good day to you. a tweet from the u.s. president's personal account raises a stubborn and haunting question, what did the president know and when did he know it? the focus is on his fired national security adviser michael flynn. the tweet reads, i had to fire general flynn because he lied to the vice president and the fbi. he has pled guilty to those lies, it is a shame because his actions during the transition were lawful. there was nothing to hide, explanation point, from u.s. president donald trump. if true this tweet is explosive. it means mr. trump knew michael flynn had broken the law when he asked the then fbi director james comey in february to drop the investigation into flynn. here's what the president said saturday. >> what has been shown is no collusion, no collusion. there has been absolutely -- there has been absolutely no collusion. so we're very happy. and frankly, last night was one