
    Roland ADAMS, Petitioner, v. U.S. ATTORNEY GENERAL, Respondent.
    No. 10-13921.
    United States Court of Appeals, Eleventh Circuit.
    July 12, 2012.
    Tania Galloni, Miami, FL, for Petitioner.
    Roland Adams, Elk Grove, CA, pro se.
    Gladys Steffens-Guzman, David Bernal, Nicholas Harling, Ernesto H. Molina, Jr., Krystal Samuels, U.S. Department of Justice — Office of Immigration Litigation, Eric Holder, Jr., U.S. Attorney General’s Office, Washington, DC, Alfie Owens, DHS Chief Counsel, Atlanta, GA, for Respondent.
    Before EDMONDSON and ANDERSON, Circuit Judges, and EDENFIELD, District Judge.
    
      
       Honorable B. Avant Edenfield, United States District Judge for the Southern District of Georgia, sitting by designation.
    
   PER CURIAM:

This case is an immigration case; Petitioner Roland Adams asks us to review a decision by the Board of Immigration Appeals (“BIA”) affirming an immigration judge’s removal order. The removal proceedings are based on Petitioner’s criminal conviction. At the time of the pertinent criminal conviction, Petitioner was a naturalized American citizen. Later, Petitioner’s citizenship was revoked; Immigration and Customs Enforcement charged Petitioner as a removable alien and began removal proceedings against him.

The BIA erred in construing statutory language — “[a]ny alien who is convicted of an aggravated felony at any time after admission is deportable,” 8 U.S.C. section 1227(a)(2)(A)(iii) (emphasis added) — to apply to Petitioner. This issue of pure statutory construction is for courts to decide. See INS v. Cardozar-Fonseca, 480 U.S. 421, 107 S.Ct. 1207, 1221, 94 L.Ed.2d 434 (1987); cf. United States v. Home Concrete & Supply, LLC, — U.S.-, 132 S.Ct. 1836, 1843, 182 L.Ed.2d 746 (2012) (involving re-enactment of a statute after it had been construed by Supreme Court). And given the statute’s wording, the guidance of Costello v. INS, 376 U.S. 120, 84 S.Ct. 580, 11 L.Ed.2d 559 (1964), the rule of lenity, and Congress’s long acquiescence in Costello’s construction of the words “ ‘[a]ny alien ... shall ... be deported who ... at any time after entry is convicted,’ ” id. at 581 (emphasis added) (quoting the INA of 1952, ch. 5, § 241(a)(4), 66 Stat. 204 (current version at 8 U.S.C. § 1227(a)(2)(A)®)), we grant the petition for review and vacate the removal order. The pertinent statute does not apply to a person who was a naturalized citizen when convicted. Petitioner may not be deported pursuant to section 1227(a)(2)(A)(in) for this criminal conviction.

PETITION GRANTED; VACATED and REMANDED. 
      
      . In response to Adams’s petition for review, the government argues for the first time that the pertinent criminal conviction became final after Petitioner lost his citizenship. By failing to present this argument to the IJ and to the BIA, the government waived the argument.
     