5 U.S.C. § 706 : US Code - Section 706: Scope of review

      To the extent necessary to decision and when presented, the
    reviewing court shall decide all relevant questions of law,
    interpret constitutional and statutory provisions, and determine
    the meaning or applicability of the terms of an agency action. The
    reviewing court shall - 
        (1) compel agency action unlawfully withheld or unreasonably
      delayed; and
        (2) hold unlawful and set aside agency action, findings, and
      conclusions found to be - 
          (A) arbitrary, capricious, an abuse of discretion, or
        otherwise not in accordance with law;
          (B) contrary to constitutional right, power, privilege, or
          (C) in excess of statutory jurisdiction, authority, or
        limitations, or short of statutory right;
          (D) without observance of procedure required by law;
          (E) unsupported by substantial evidence in a case subject to
        sections 556 and 557 of this title or otherwise reviewed on the
        record of an agency hearing provided by statute; or
          (F) unwarranted by the facts to the extent that the facts are
        subject to trial de novo by the reviewing court.

    In making the foregoing determinations, the court shall review the
    whole record or those parts of it cited by a party, and due account
    shall be taken of the rule of prejudicial error.