mueller did so because practically they didn't have a huge amount ofhoice. >> sol weisenberg what is about, the argument that he did really have much choice. >> well, i would say-- there are two points i would make,t is true you have u.s. versus nixon but there is a case from 1997 in the d.c. circuit that is a controlling w. and it is not a cake walk, necessarily, to overcome executive privilege, special counsel can't just say i'm running a grand ju investigation. there say real question with bob mueller whether he even has t right under his chart tore even litigate questions of executive privilege. however, if you are the president and the president's team, do you really want to be seen as invoking executive privilege, particularly that early in th investigation when gk man went in. i think it looks terrible. and so i don't copletely agree with katherine, i think the law isn't quite as strong as she suggests but really there hasn't been a lot of litigation on it. >> let's movon just quckly to what we know, katherine ruemmler, of what this investigation amounts to so far. from what y