let's just set the scene. february 14th. everybody knows there is a pending fbi investigation of michael flynn, of the trump campaign regarding false statements he may have made. >> white house has been informed by sally yates that the fbi has already interviewed michael flynn. >> correct. there is a pending investigation. donald trump tells his attorney general and his vice president to leave the room, suggesting that he wants to say something that he doesn't want overheard. at that point he says to director comey, please let it go. end the investigation. that if it is true, if it's borne out by records, tapes, whatever, that to me is the definition of obstruction of justice. richard nixon on june 23rd, 1972, six days after the watergate break-in, he said to h.r. haldeman, tell the fbi stop investigating watergate. >> he wanted to get somebody from the cia to tell the fbi.