OPINION OF THE COURT

Petitioner, Hwie Liong Lim, petitions for review of the decision of the Board of Immigration Appeals which denied his application for asylum as untimely. Petitioner filed his asylum application almost four years after he arrived in the United States. Pursuant to 8 U.S.C. § 1158(a)(2)(B), an alien must file his application for asylum within one year of his arrival in the United States. Only upon a showing of changed circumstances which materially affect the alien’s eligibility for asylum or of extraordinary circumstances explaining the delay will this limitations period be extended. See 8 U.S.C. § 1158(a)(2)(D). Because Petitioner filed his application almost three years after the filing deadline, and there existed no reason for extending the one year limitations period, the Immigration Judge denied his application as untimely. Because the Board adopted and affirmed the Immigration Judge’s opinion, we review her opinion as the opinion of the Board. See Zhang v. Gonzales, 405 F.3d 150, 155 (3d Cir. 2005).

With respect to Petitioner’s asylum application, we lack jurisdiction to review the Board’s denial. See 8 U.S.C. § 1158(a)(3); Tarrawally v. Ashcroft, 338 F.3d 180, 185 (3d Cir. 2003). We will therefore dismiss the petition for review of Lim’s claim.

With respect to the Board’s denial of withholding of removal, Petitioner did not adequately raise this issue in his opening brief, and it is waived. Although Petitioner twice asserted in the argument section of his brief that he was eligible for withholding of removal, he provided no substantive legal argument to support his assertion. See Voci v. Gonzales, 409 F.3d 607, 610 n. 1 (3d Cir. 2005) (quoting Kopec v. Tate, 361 F.3d 772, 775 n. 5 (3d Cir. 2004) (“An issue is waived unless a party raises it in its opening brief, and for those purposes a passing reference to an issue will not suffice to bring that issue before an *144appellate court.”))1 We therefore will deny the petition for review.