34 U.S.C. § 40916: Illegal immigrant gun purchase notification

(a) In generalNotwithstanding any other provision of law or of this chapter, all records obtained by the National Instant Criminal Background Check system relevant to whether an individual is prohibited from possessing a firearm because such person is an alien illegally or unlawfully in the United States shall be made available to U.S. Immigration and Customs Enforcement. (b) RegulationsThe Attorney General, at his or her discretion, shall promulgate guidelines relevant to what records relevant to illegal aliens shall be provided pursuant to the provisions of this chapter.