; and (B) by an individual who is a citizen of the United States. (2) Limitation on acceptance A conditional gift may not be accepted under paragraph (1) if the conditional gift is conditioned upon carrying out any act or purpose that will require an expenditure of funds in an amount that exceeds the amount of the conditional gift, unless the expenditure has been approved by an Act of Congress. (c) Limitation on use The principal of and income from any covered conditional gift shall be held, invested, reinvested, and used in accordance with the conditions of the conditional gift, except that the principal of and income from a conditional gift may not be invested or reinvested in a manner in which the principal of or income from the conditional gift will accrue interest. (d) Budget justifications In the annual budget justification submitted by each Executive department, the head of the Executive department shall include, with respect to the year preceding the date on which the budget justification is submitted, a statement of— (1) each covered conditional gift accepted on behalf of the Executive department during the year preceding the date on which the annual budget justification is submitted; (2) how each covered conditional gift described in paragraph (1) was used by the Executive department; and (3) as applicable, the account or fund in which the funds from each covered gift described in paragraph (1) are deposited. (e) Deficit reduction If funds from a covered conditional gift remain unexpended after carrying out the conditional act or purpose of the covered conditional gift and are not required to carry out any other conditional act or purpose of the covered conditional gift— (1) the head of the Executive department to which the covered conditional gift was made may, at the discretion of the head of the Executive department, transfer the remaining funds to the Secretary of the Treasury