19 U.S.C. § 2321: Subpena power

(a) Subpena by SecretaryThe Secretary may require by subpena the attendance of witnesses and the production of evidence necessary for him to make a determination under the provisions of this part. (b) Court orderIf a person refuses to obey a subpena issued under subsection (a), a United States district court within the jurisdiction of which the relevant proceeding under this part is conducted may, upon petition by the Secretary, issue an order requiring compliance with such subpena.