31 U.S.C. § 712

(1)

investigate all matters related to the receipt, disbursement, and use of public money;

(2)

estimate the cost to the United States Government of complying with each restriction on expenditures of a specific appropriation in a general appropriation law and report each estimate to Congress with recommendations the Comptroller General considers desirable;

(3)

analyze expenditures of each executive agency the Comptroller General believes will help Congress decide whether public money has been used and expended economically and efficiently;

(4)

make an investigation and report ordered by either House of Congress or a committee of Congress having jurisdiction over revenue, appropriations, or expenditures; and

(5)

give a committee of Congress having jurisdiction over revenue, appropriations, or expenditures the help and information the committee requests.