the combined use of the credits, loans, or guarantees offered by the Bank with concessional financing or grants made available under subsection (d), by methods including the blending of the financing of, or parallel financing by, the Bank and the Trade and Development Agency; and

the combination of concessional financing or grants made available under subsection (d) with financing offered by private financial institutions or entities, by methods including the blending of the financing of, or parallel financing by, the Trade and Development Agency and private institutions or entities.

Funds which are used to carry out a tied aid credit program authorized by subsections (a) and (b) shall be offered only to finance United States exports which can reasonably be expected to contribute to the advancement of the development objectives of the importing country or countries, and shall be consistent with the economic, security, and political criteria used to establish country allocations of Economic Support Funds.

The Director of the Trade and Development Agency is authorized to establish a fund, as necessary, for carrying out a tied aid credit financing program as described in this section.