"The Special Counsel's decision to describe the facts of his obstruction investigation without reaching any legal conclusions leaves it to the Attorney General to determine whether the conduct described in the report constitutes a crime. ...Deputy Attorney General and I have concluded that the evidence ...is not sufficient to establish that the President committed an obstruction-of-justice offense. Our determination was made without regard to, and is not based on, the constitutional considerations that surround the indictment and criminal prosecution of a sitting president."