so it can be a very precarious situation for the president to go into an interview ground rules or no. >> so, jack, to your ground rules point let me ask you this, let's say they agree on ground rules, we can agree on this but not this, the president starts to talk but takes them into an area that had been walled off by ground rules. that's now open. that's fair game, correct? >> that happens often just because of the dynamic of an interview especially a voluntary interview as opposed to, for example, some compelled testimony before a grand jury. either because the witness wants to say his or her piece and gets off topic, so to speak, or defense counsel thinks no harm is being done or even some haze