MR.
CHIEF JUSTICE BURGER delivered the
opinion of the Court.
nThis litigation presents for review the denial of a motion, filed in the District Court on behalf of the President of the United States, in the case of United States v. Mitchell (D.C. Crim. No. 74-110),
nto quash a third-party subpoena duces tecum issued by the United States District Court for the District of Columbia. The subpoena directed the President to produce certain tape recordings and documents relating to his conversations with aides and advisers