>> jim acosta, appreciate that. thanks. the president asking donman began and others to try to keep jeff sessions on board or the reported effort to gather dirt on james comey. laying down talking points on the trump tower meeting he must have known weren't true. it's all focussing attention on a single question, does it add up to obstruction of justice or merely a president exercising his legitimate authorities as chief executive? joining us now is richard blumenthal. we now know it wasn't just don mcgahn pressuring jeff sessions not to recuse himself. two other high-ranking white house officials. do you see this as obstruction of justice? >> this excellent reporting certainly indicates a key element of an obstruction of justice case, which is corrupt intend. what is building here, it may not have reached the threshold of proof beyond a reasonable doubt, to try to shut down the