; and (2) before United States forces are introduced into the territory, airspace, or waters of a foreign country in which there are already United States forces equipped for combat if the introduction of such forces would substantially enlarge the overall number of United States forces equipped for combat located in that country or otherwise substantially increase the military capabilities of United States forces. (c) In the event that circumstances prohibit the notification required by subsection (b) prior to the introduction of United States forces, the President shall provide such notification not later than 48 hours after such introduction, including an explanation of why it could not be offered prior to such introduction. (d) The notification required by subsection (b) or (c) shall include, at a minimum, the circumstances necessitating the introduction of United States forces, the statutory or constitutional authority for such introduction, and the expected scope and duration of the use of such forces. . 104. Specific statutory authorization required The War Powers Resolution ( 50 U.S.C. 1541 et seq. ) is amended— (1) by striking sections 4, 5, 6, and 7; (2) by redesignating sections 8, 9, and 10 as sections 6, 11, and 12, respectively; and (3) by inserting after section 3 the following: 4. Specific Statutory Authorization Required (a) In the absence of a declaration of war, and except as provided in subsection (b), United States forces may be introduced into hostilities or into situations where there is a serious risk of hostilities only if, before introducing such forces— (1) the President submits to the appropriate congressional committees and leadership an initial report in accordance with the requirements of subsection (d)(1) for the use of such forces