8 CFR 340.2: Revocation proceedings pursuant to section 340(a) of the Act.

(a) Recommendations for institution of revocation proceedings. Whenever it appears that any grant of naturalization may have been illegally procured or procured by concealment of a material fact or by willful misrepresentation, and a prima facie case exists for revocation pursuant to section 340(a) of the Act, USCIS will make a recommendation regarding revocation.

(b) Recommendation for criminal prosecution. If it appears to USCIS that a case described in paragraph (a) of this section is amenable to criminal penalties under 18 U.S.C. 1425 for unlawful procurement of citizenship or naturalization, the facts will be reported to the appropriate United States Attorney for possible criminal prosecution.