i think as jill was suggesting, it may be that bob mueller has now begun to view the president as a target of the investigation. and because the department of justice has a policy that they don't allow prosecutors to subpoena targets of the grand juries investigation because of the might against self-incrimination. there is an exception to that, but it is a rarely used exception, i think that may mean we never hear from the president, not in a voluntary interview, not under subpoena before a grand jury and then bob mueller moves on to the next phase of his work and that may be returning indictments. it may be authoring a report that gets released to congress. it may be a combination of the two. it may be that bob mueller decides to return a conspiracy indictment naming everybody but the president and just putting everything he's learned about the president's misdeeds into a report to congress and let congress handle it as a political issue and then again it may be as i know mrs. wine-banks can tell us, that he will choose to name the