vindman says his efforts to correct the transcript after the fact were blocked. adding to the fallout from this democratic senator chuck seumer is now asking the secretary of the army for a briefing to ensure that colonel vindman is protected from any potential retaliation after his testimony and the criticism coming well from the white house on down from his allies. so there is a lot to get to as always, cnn manu raju is there, can you layout for folks what are you learning ability colonel vindman's account to investigators and what it means to the impeachment inquiry? >> reporter: well, this is the first white house official, first person who has testified to this committee who was actually listening in on that july phone call, someone who said he was so concerned about what he had heard, that he reported those concerns on multiple occasions to the national security counsel's top attorney.