his decisions, is within the realm of executive privilege. the most powerful assertion requires there to be something about the president's seeking information for which to make a decision. and if that's the case, then it fits within its definition. it is most powerful when it is the congress trying to invade the executive branch's deliberative process. it is least powerful in a criminal investigation, as we learned in the nixon tames. >> i'll not the lawyer. you are. not only is the president tweeting but specifically, the president. james comey, you'd better hope there are no tapes. there's this idea of waiving any executive privilege. when he said it publicly. is that correct? >> so executive privilege has the last name privilege. the first name executive.