obstruction of justice against the president, that mueller has something else he's working on and sdny, of course, does as well? >> it's very difficult to read the tea leaves here because it's entirely possible that mueller could have obstruction charges in the works against any number of potential defendants. it's unlikely that his charges will extend to the president given doj policy. so, it would be entirely appropriate for investigators on the hill to independently -- to independently look at obstruction and make a determination about whether that should be a charge for potential impeachment proceedings. >> where does this investigation lie right now versus where mueller, where the congressional investigations are headed right now? >> i think it was really notable when this morning the chairman of the house judiciary committee, jerry nadler, said he does believe the president committed obstruction of justice. that's extremely significant