2 FBI v. FAZAGA Syllabus against court-ordered disclosure of state and military secrets.” General Dynamics Corp., 563 U. S., at 484. Congress enacted FISA to provide special procedures for use when the Government wishes to conduct foreign intelligence surveillance in light of the special national-security concerns such surveillance may present. See Clapper v. Amnesty Int’l USA, 568 U. S. 398, 402. When information is lawfully gathered pursuant to FISA, §1806 permits its use in judicial and administrative proceedings but specifies procedures that must be followed before that is done. Subsection (f) of §1806 permits a court to determine whether information was lawfully gathered “in camera and ex parte” if the “Attorney General files an affidavit under oath that disclosure or an adversary hearing would harm the national security of the United States.” §1806(f). Central to the parties’ argumentation in this Court, and to the Ninth Circuit’s decision below, is the correct interpretation of §1806(f). The Ninth Circuit’s conclusion that Congress intended FISA to displace the state secrets privilege rested in part on its conclusion that §1806(f)’s procedures applied to this case. The Government contends that the Ninth Circuit erred because §1806(f) is a narrow provision that applies only when an aggrieved person challenges the admissibility of surveillance evidence. Respondents interpret §1806(f) more broadly, arguing that it also can be triggered when a civil litigant seeks to obtain secret surveillance information, as respondents did here, and when the Government moves to dismiss a case pursuant to the state secrets privilege. The Court does not resolve the parties’ dispute about the meaning of §1806(f) because the Court reverses the Ninth Circuit on an alternative ground. Pp. 7–9. (b) Section 1806(f) does not displace the state secrets privilege, for two reasons. Pp. 9–13. (1) The text of FISA weighs heavily against the argument that Congress intended FISA to displace the state secrets privilege. The absence of any reference to the state secrets privilege in FISA is strong evidence that the availability of the privilege was not altered when Congress passed the Act. Regardless of whether the state secrets privilege is rooted only in the common law (as respondents argue) or also in the Constitution (as the Government argues), the privilege should not be held to have been abrogated or limited unless Congress has at least used clear statutory language. See Norfolk Redevelopment and Housing Authority v. Chesapeake & Potomac Telephone Co. of Va., 464 U. S. 30, 35; Jennings v. Rodriguez, 583 U. S. __, __. P. 9. (2) Even on respondents’ interpretation of §1806(f), nothing about the operation of §1806(f) is incompatible with the state secrets privilege. Although the Ninth Circuit and respondents view §1806(f) and