statement. i talked about that before. >> reporter: a key question that remains, whether the president knew about the meeting's true purpose ahead of time. >> do you tell your father anything about this? >> no. it was such a nothing. there was nothing to tell. >> reporter: despite that, the president's top advisers defend the characterization that the russian investigation is a hex. >> the issue for the president i think is the political argument made by the opponents that somehow he conspired with the russians and helped him defeat hillary clinton and thinks that's the hoax. that's what i understand it to be. >> reporter: now, as for the worries inside the president's team about the tweeting, there's been concerns inside mr. trump's team of legal advisers for sometime now. a past attorney recalled ty cobb stepped down in part from the position over this concern about the president's tweets on the