Funds available to carry out chapter 4 of part II of the Foreign Assistance Act of 1961 [
22 U.S.C.
2346 et seq.] may be used by the Director of the Trade and Development Agency, with the concurrence of the Secretary of State (as provided under section 531 of the Foreign Assistance Act of 1961 [
22 U.S.C.
2346]), for the purposes for which funds made available under this subsection are authorized to be used in section
635q of this title and this section. The Secretary of State shall exercise his authority in cooperation with the Administrator of the Agency for International Development. Funds made available pursuant to this subsection may be used to finance a tied aid credit activity in any country eligible for tied aid credits under this subchapter.