As soon as practicable after
July 1, 1977, but not later than
September 1, 1977, the President shall issue a decision as to whether a transportation system for delivery of Alaska natural gas should be approved under this chapter. If he determines such a system should be so approved, his decision shall designate such a system for approval pursuant to
section 719f of this title and shall be consistent with
section 719c(b)(1)(C) of this title to assure delivery of Alaska natural gas to points both east and west of the Rocky Mountains in the continental United States. The President in making his decision shall take into consideration the Commission’s recommendation pursuant to
section 719c of this title, the report under
section 719c(c) of this title, and any comments submitted under
section 719d of this title; and his decision to designate a system for approval shall be based on his determination as to which system, if any, best serves the national interest.