The Secretary of the Treasury may purchase any obligations issued under subsection (a). For such purpose, the Secretary may use as a public debt transaction the proceeds of the sale of any securities issued under chapter 31 of title 31, and the purposes for which securities may be issued under such chapter are extended to include such purpose.

The Secretary of the Treasury shall not at any time purchase any obligations under this subsection if the purchase would increase the aggregate principal amount of the outstanding holdings of obligations under this subsection by the Secretary to an amount greater than $2,250,000,000.

Each purchase of obligations by the Secretary of the Treasury under this subsection shall be upon terms and conditions established to yield a rate of return determined by the Secretary to be appropriate, taking into consideration the current average rate on outstanding marketable obligations of the United States as of the last day of the month preceding the making of the purchase.

The Secretary of the Treasury may at any time sell, upon terms and conditions and at prices determined by the Secretary, any of the obligations acquired by the Secretary under this subsection.

All redemptions, purchases and sales by the Secretary of the Treasury of obligations under this subsection shall be treated as public debt transactions of the United States.

Any person, trust, or organization created pursuant to or existing under the laws of the United States or any State shall be authorized to purchase, hold, and invest in mortgages, obligations, or other securities which are or have been sold by the Corporation pursuant to this section or pursuant to section 1454 of this title to the same extent that such person, trust, or organization is authorized under any applicable law to purchase, hold, or invest in obligations issued by or guaranteed as to principal and interest by the United States or any agency or instrumentality thereof. Where State law limits the purchase, holding, or investment in obligations issued by the United States by such a person, trust, or organization, such Corporation mortgages, obligations, and other securities shall be considered to be obligations issued by the United States for purposes of the limitation.

The provisions of paragraph (1) shall not apply with respect to a particular person, trust, or organization or class thereof in any State which, after December 21, 1979, enacts a statute which specifically names the Corporation and either prohibits or provides for a more limited authority to purchase, hold, or invest in such securities by such person, trust, or organization or class thereof than is provided in paragraph (1). The enactment by any State of any statute of the type described in the preceding sentence shall not affect the validity of any contractual commitment to purchase, hold, or invest which was made prior thereto.

Any authority granted by paragraph (1) and not granted by any other Federal statute shall expire as of the end of June 30, 1985. Such expiration shall not affect the validity of any contractual commitment to purchase, hold, or invest which was made prior thereto pursuant to paragraph (1), and shall not affect the validity of any contractual commitment or other action to purchase, hold, or invest pursuant to any other authorization.

The Corporation may not guarantee mortgage-backed securities or mortgage related payment securities backed by mortgages not purchased by the Corporation.

The Corporation shall insert appropriate language in all of the obligations and securities of the Corporation issued under this section and section 1454 of this title clearly indicating that such obligations and securities, together with the interest thereon, are not guaranteed by the United States and do not constitute a debt or obligation of the United States or any agency or instrumentality thereof other than the Corporation.

Any notes, debentures, or substantially identical types of unsecured obligations of the Corporation evidencing money borrowed, whether general or subordinated, shall be issued upon the approval of the Secretary of the Treasury and shall have such maturities and bear such rate or rates of interest as may be determined by the Corporation with the approval of the Secretary of the Treasury.

Any notes, debentures, or substantially identical types of unsecured obligations of the Corporation having maturities of 1 year or less that the Corporation has issued or is issuing as of August 9, 1989, shall be deemed to have been approved by the Secretary of the Treasury as required by this subsection. Such deemed approval shall expire 365 days after August 9, 1989.

Any notes, debentures, or substantially identical types of unsecured obligations of the Corporation having maturities of more than 1 year that the Corporation has issued or is issuing as of August 9, 1989, shall be deemed to have been approved by the Secretary of the Treasury as required by this subsection. Such deemed approval shall expire 60 days after August 9, 1989.

Any securities in the form of debt obligations or trust certificates of beneficial interest, or both, and based upon mortgages held and set aside by the Corporation, shall be issued upon the approval of the Secretary of the Treasury and shall have such maturities and shall bear such rate or rates of interest as may be determined by the Corporation with the approval of the Secretary of the Treasury.

Any securities in the form of debt obligations or trust certificates of beneficial interest, or both, and based upon mortgages held and set aside by the Corporation, that the Corporation has issued or is issuing as of August 9, 1989, shall be deemed to have been approved by the Secretary of the Treasury as required by this subsection.