tweeting the probe is a rigged system and then threatening that at some point i will have no choice but to use the powers granted to the presidency and get involved. that's a clear response to rod rosenstein's unambiguous push back against house republicans interfe interference. a march 5th meeting where robert mueller said he could subpoena the president. according to the post, two witnesses say the president's then lawyer replied, this isn't some game. you're screwing with the work of the presidency of the united states. joining me now nbc justice correspondent pete williams, nbc national correspondent, peter alexander. former u.s. attorney and fbi official. we have a full house. let's start with you and the president on twitter today clearly new threats.