created by an attack or imminent threat of attack upon the United States, its territories or possessions, or the Armed Forces, submit to Congress a report on the matters described in paragraphs (1), (2), and (3) of subsection (a). (2) Deadline The report required under paragraph (1) shall be submitted to Congress not later than 48 hours after introduction of United States Armed Forces into hostilities, or into situations where imminent involvement in hostilities is clearly indicated by the circumstances, as described in paragraph (1), and an update of such report shall be submitted to Congress not later than 60 days after the date of submission of the initial report. 5. Rules of construction Nothing in this Act, or any amendment made by this Act, shall be construed— (1) to alter the constitutional authority of Congress or of the President, or the provisions of existing treaties