lashed out even further. it would seem very hard to obstruct justice for a crime that never happened, witch hunt. legal experts say that argument doesn't hold up. >> you absolutely can obstruct a crime that never occurred. >> reporter: the obstruction of justice angle of the mueller probe is clear in numerous questions asking for the details behind the firing of michael flynn and james comey and the uncertain status. did you discuss whether mr. sessions would protect you and how was the decision made to fire mr. flynn on february 13th, 2017. regarding the decision to fire mr. comey, when was it made and why and who played a role? the official justification for comey's firing was his handling of the clinton e-mail probe. but the president acknowledged russia played a part in a tv interview days later. >> when i decided to just do it, i said to myself, i said, you know, this russia thing with trump and russia is a made up story. >> reporter: the questions touch on a long list of trump associates and government