No bridge may be constructed, maintained, and operated as provided in section 535 of this title unless the President has given his approval thereto. In the course of determining whether to grant such approval, the President shall secure the advice and recommendations of (1) the United States section of the International Boundary and Water Commission, United States and Mexico, in the case of a bridge connecting the United States and Mexico, and (2) the heads of such departments and agencies of the Federal Government as he deems appropriate to determine the necessity for such bridge.