31 U.S. Code § 3804 - Subpoena authority
For the purposes of an investigation under section 3803(a)(1) of this title, an investigating official is authorized to require by subpoena the production of all information, documents, reports, answers, records, accounts, papers, and data not otherwise reasonably available to the authority.
(b) For the purposes of conducting a hearing under section 3803(f) of this title, a presiding officer is authorized—
In the case of contumacy or refusal to obey a subpoena issued pursuant to subsection (a) or (b) of this section, the district courts of the United States shall have jurisdiction to issue an appropriate order for the enforcement of any such subpoena. Any failure to obey such order of the court is punishable by such court as contempt. In any case in which an authority seeks the enforcement of a subpoena issued pursuant to subsection (a) or (b) of this section, the authority shall request the Attorney General to petition any district court in which a hearing under this chapter is being conducted, or in which the person receiving the subpoena resides or conducts business, to issue such an order.