Subsection (a) of this section shall not apply with respect to any diplomatic construction or design project in a foreign country whose statutes prohibit the use of United States contractors on such projects. The exception contained in this subsection shall only become effective with respect to a foreign country 30 days after the Secretary of State certifies to the Committee on Foreign Affairs and the Committee on Appropriations of the House of Representatives and the Committee on Foreign Relations and the Committee on Appropriations of the Senate what specific actions he has taken to urge such foreign country to permit the use of United States contractors on such projects, and what actions he shall take with respect to that country as authorized by title II of the State Department Basic Authorities Act of 1956 (
22 U.S.C.
4301 et seq.; commonly referred to as the “Foreign Missions Act”).