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Unprecedented. >> reporter: twitter is where the president goes to take the pulse of his base, analysts say, before he makes a decision. it's also a vehicle to validate his viewpoints, illustrated by his frenzy binges of re-tweeting others. >> he has all the power that comes with the office and, yet, he's insecure. he's so insecure that he's going to his twitter feed to pump himself up. >> reporter: sometimes, the sources from which the president retweets have questionable credibility or are downright dangerous, like his 2017 re-tweet of three videos from a british anti-muslim twitter account....

Phenomenal tournament just dominating the field. 13 under par, and he's looking for more history this weekend. the reigning pga champ and also the two-time u.s. open champ, and no one has ever held back to back titles in two majors at the same time. >> i mean, i would like that lead to grow as large as it possibly can. i'm going to go out there and do what i can do. keep putting the ball in the right spot and i should have a good chance of winning the championship. >> reporter: koepka has a seven-shot lead right now in round three. adam scott is one of those golfers out there, hoping that koep...

>> the 2-1 pitch. >> reporter: you could say this story started way back in 1969 when the new york mets upset the heavily favored orioles to win their first world series. >> the mets are the world champions. >> reporter: we could say that, but that was before brian cooney's time. >> you didn't know about the miracle mets. >> i was too young. i was born four years after. >> reporter: we'll get back to the ball game. for now what you need to know is brian is a port authority police officer at laguardia airport. he was also a 9/11 first responder, a guy who knows about going beyond the call of du...

Refused to comply with a congressional subpoena for trump's tax returns. boris, how are house democrats responding? what's next? >> reporter: well, the chairman of the house ways and means committee, richard neal, who had been leading this effort to get six years of the president's tax returns said he wants to see it end in court. he is not taking a route that other democrats, like jerry nadler had before, in holding administration officials in contempt of congress. he says he doesn't want to do that with the treasury secretary. instead, he wants to see this wind up in a courtroom. there are t...

Trump's message to the masses. dan scavino is one of the original and trusted advisers at trump's side. he started as trump's golf caddy. here is brian todd. >> reporter: for a president obsessed with polls and ratings, there is nothing he loves more than the popularity barometer in his pocket, his twitter account. >> we have almost 60 million on twitter. >> reporter: the president has become so reliant on twitter that "politico" says in a meeting earlier this year, he stopped a conversation with frustrated lawmakers about his decision to pull troops out of syria in order to consult his twitte...