; publication Each congressional leader shall record the official time of the chamber at receipt. In the case of notification to a congressional leader in both physical and electronic form, the time recorded shall be the time of receipt of the form that was received first. Each congressional leader shall, immediately upon such receipt, inform the Clerk of the House or the Secretary of the Senate (as the case may be) of the time of receipt, to be recorded and published by the Clerk or Secretary. (cc) 48-hour period defined In this subsection, the term 48-hour period means the 48-hour period that begins at the third earliest of the 4 times recorded under item (bb), including any extension of such period under paragraph (4)(D) and excluding any period disregarded under paragraph (4)(C)(v). (II) Senior Government officials The President shall transmit such notification in such a manner so as to ensure delivery to each senior Government official not more than 1 hour after the third earliest of the 4 times recorded under subclause (I)(bb). (C) Public availability (i) Presumptively public Except as provided in clause (ii), the President shall publicly release a notification transmitted under subparagraph (A) at the time when the 48-hour period begins. (ii) Temporary withholding and release (I) Withholding The President may withhold from public release under clause (i) a portion of a notification transmitted under subparagraph (A) only to the extent that the President determines that— (aa) secrecy of such portion is necessary to protect against an imminent and specific threat to human life