ideal, but they are working aggressively behind the scenes to try to figure out how to get some of those key people before their committee in the public. >> and they're being stonewalled, not responding to testify at all. laura, the former u.s. attorney joyce vance also testified. i want to get your reaction to this exchange with sheila jackson lee where she reads in the mueller rart about the call trump made directing mcgahn to fire mueller. watch this. >> mcgahn recalled the president saying mueller has to go. and call me back. when you do it, mcgahn understood the president to be saying that the special counsel had to be removed by rosenstein. what do you believe or what is your reaction to this exchange, and would you find such behavior concerning? professor vance and then professor mcquaid. >> yes, this conduct to me seems to have all the elements prosecutors would need to have to successfully charge obstruction of justice. there's an obstructive act, the