; and (II) the amount that is 50 percent of such cost estimate; and (ii) the Secretary submits to the appropriate congressional committees a notification of the exercise of the adjustment. (B) Scope The Secretary may modify the scope of a project subsequent to a waiver by the President of the dollar amount limitation in subsection (a) if the Secretary submits to the appropriate congressional committees a notification of the exercise of the modification. ; (4) in paragraph (4) (as so redesignated)— (A) in subparagraph (A), by adding at the end the following: A project with respect to which the exercise of a further adjustment to the total cost of the project under paragraph (2)(A) applies or with respect to which the exercise of a modification to the scope of the project under paragraph (2)(B) applies may only be carried out after the end of a 15-day period beginning on the date on which the appropriate congressional committees receive the notification required by paragraph (2)(A) or (2)(B), as the case may be. ; and (B) in subparagraph (B), in the matter preceding clause (i), by inserting , (2)(A), or (2)(B) after (1)(B) ; and (5) in paragraph (6) (as so redesignated)— (A) by striking waiver authority and inserting waiver and other authorities ; and (B) by striking December 31, 2023 and inserting December 31, 2024 . 1264. Extension and modification of authority to provide assistance to vetted Syrian groups and individuals (a) Extension Subsection (a) of section 1209 of the Carl Levin and Howard P. Buck McKeon National Defense Authorization Act for Fiscal Year 2015 ( Public Law 113–291 ; 128 Stat. 3541) is amended, in the matter preceding paragraph (1), by striking December 31, 2023 and inserting December 31, 2024 . (b) Limitation on cost of construction and repair projects Subsection (l) of such section is amended— (1) in paragraph (1)(A), by striking $4,000,000 and inserting $6,000,000