in the situation room. this was not an election, this was a revolution. reporter: as donald trump s national security advisor, michael flynn will be at the table for every major defense and foreign policy decision by the president. a retired three-star general who helped dismantle extremist networks in afghanistan, flynn is known as a skilled intelligence officer, even though he was forced out from the pentagon as head of the defense intelligence agency for his combative management style. really bright, incredibly hard working. i do think most of his life experience has been at the tactical level, where he has incredibly successful. reporter: on the campaign trail flynn was a vocal critic of hillary clinton s private e-mail server and the clinton foundation foreign dealings. we do not need a reckless president who believes that she is above the law. reporter: but two former government officials with direct knowledge tell c. in n while in afghanistan flynn