stopped a conversation with frustrated lawmakers about his decision to pull troops out of syria in order to look at his twitter account. trump's social media adviser walked in. trump instructed him to tell e him how popular my policy is. he took the congressman through the positive response trump had gotten to the syria decision on social kblemedia. >> i think the thing that matters the most is he be affirmed by the people who love him. the people who respond every time he says something. he uses twitter almost as a personal polling service. >> reporter: the president has relied on twitter to share his grievances and announce major decisions. those who study him say more and more he seems to be using twitter to gauge the reaction of his base over the advice of his administrati administration. a forcry historians say from president who is relied on