H.Amdt.666 - Amendment requires the DNI to cooperate with GAO inquiries that are initiated by Committees; allows all committees of jurisdiction to request that GAO perform audits of the intelligence community; allows the DNI to designate certain reports or portions of reports as sources and methods sensitive or reportable only to the intelligence committees and requiring that those reports or portions would go only to the intelligence committees; and establishes certain procedures to ensure that GAO safeguards information.