we're joined by sara murray. sara, what's the big picture here? >> i think what we're learning is special counsel robert mueller has questions with regard to how they relate to collusion. he has questions as they relate to obstruction of justice and there's not just a few of them, there are dozens. tonight a new glimpse into some of the areas robert mueller wants to cover with the president according to "the new york times." among them, why did president trump decide to fire fbi director james comey? what did candidate trump know about russian hacking during the 2016 campaign? and when did trump learn about that june 2016 trump tower meeting between his son, top campaign aides and a russian lawyer. trump lashing out today, tweeting it was made up, phony crime, collusion that never existed. and it would seem very hard to obstruct justice for a crime that never happened. witch hunt! legal experts say that argument