The Corporation is authorized to borrow from the Treasury, and the Secretary of the Treasury is authorized and directed to loan to the Corporation on such terms as may be fixed by the Corporation and the Secretary, such funds as in the judgment of the Board of Directors of the Corporation are from time to time required for insurance purposes, not exceeding in the aggregate $100,000,000,000 outstanding at any one time, subject to the approval of the Secretary of the Treasury: Provided, That the rate of interest to be charged in connection with any loan made pursuant to this subsection shall not be less than an amount determined by the Secretary of the Treasury, taking into consideration current market yields on outstanding marketable obligations of the United States of comparable maturities. For such purpose the Secretary of the Treasury is authorized to use as a public-debt transaction the proceeds of the sale of any securities hereafter issued under chapter
31 of title
31, and the purposes for which securities may be issued under chapter
31 of title
31 are extended to include such loans. Any such loan shall be used by the Corporation solely in carrying out its functions with respect to such insurance. All loans and repayments under this subsection shall be treated as public-debt transactions of the United States. The Corporation may employ any funds obtained under this section for purposes of the Deposit Insurance Fund and the borrowing shall become a liability of the Deposit Insurance Fund to the extent funds are employed therefor.