Opinion for the Court filed by Circuit Judge GINSBURG.

Fashion Valley owns a shopping mall in San Diego, California. It allows individuals and organizations to engage in expressive activities on its premises if they get a permit; in order to get a permit, an applicant must promise not to urge consumers to boycott any of the mail’s tenants. The NLRB concluded this policy violated the right to free speech guaranteed by the Constitution of California and therefore held it was an unfair labor practice; Fashion Valley petitioned this court for review. We agreed that “whether Fashion Valley violated the [National Labor Relations] Act depends upon whether it had the right, under California law, to maintain and enforce its anti-boycott rule.” 451 F.3d 241, 242 (2006). Accordingly, we certified that question to the Supreme Court of California, which held Fashion Valley’s policy violated the right to free speech guaranteed by the Constitution of California, 42 Cal.4th 850, 69 Cal.Rptr.3d 288, 172 P.3d 742 (2007), and later denied Fashion Valley’s petition for rehearing.

*1380Fashion Valley now claims the interpretation of the Constitution of California requiring it to allow protesters on its premises to urge a boycott of its tenants’ stores violates its rights under the Fifth and Fourteenth Amendments to the Constitution of the United States. It concedes, however, that it did not raise its constitutional argument until it petitioned the Supreme Court of California for rehearing. The Board argues the argument is forfeit because Fashion Valley did not raise it during the agency proceeding.

Whether Fashion Valley was required to raise its argument before the Board is not clear. “[T]here is [no] bright-line rule allowing litigants to bypass administrative [process] simply because one or all of their claims are constitutional in nature,” Marine Mammal Conservancy, Inc. v. Dep’t of Agric., 134 F.3d 409, 413 (D.C.Cir. 1998), but we have stated we may excuse a failure to exhaust administrative remedies when exhaustion would be “futile” because a claim involves “the constitutionality of a [federal] statutory provision” and would therefore be “beyond [the agency’s] competence to decide.” Ryan v. Bentsen, 12 F.3d 245, 247 (D.C.Cir. 1993). The Board has never said it lacks jurisdiction to decide whether a state law is constitutional, cf. Univ. of Great Falls, 331 NLRB No. 188, 2000 WL 1283042 at *2 (2000) (holding it beyond Board’s authority to pass upon constitutionality of a federal statute), vacated on other grounds, 278 F.3d 1335 (D.C.Cir. 2002), but clearly it has been disinclined to do so. Waremart Foods, 337 NLRB 289, 289 (2001) (“[W]e decline the Respondent’s invitation to independently evaluate the constitutionality of the State law”), vacated on other grounds, 354 F.3d 870 (D.C.Cir. 2004); Varied Enters. v. Crowder, 240 NLRB 126, 132 (1979) (“It is the general rule of law that a state statute is presumed to be constitutional until it is repealed by the legislature, or until its nullity is declared by a court of competent jurisdiction”).

We need not wade into such murky waters in this case: We have no doubt Fashion Valley forfeited its constitutional argument because it did not raise that argument in its petition for review by this court. See, e.g., Nat’l Steel & Shipbuilding Co. v. NLRB, 156 F.3d 1268, 1273 (D.C.Cir. 1998) (“[Petitioner] failed in its opening brief to this court to contest the Board’s finding.... Consequently, that claim is waived”). Fashion Valley could and should have argued that if the Board’s understanding of California’s constitutional guarantee of free speech was correct, then that free speech provision, as applied, violated the Constitution of the United States. Having that argument before us would have facilitated our decision to certify the question of state law to the Supreme Court of California. See Arizonans for Official English v. Arizona, 520 U.S. 43, 79, 117 S.Ct. 1055, 137 L.Ed.2d 170 (1997) (noting that certification is especially appropriate “when a federal court is asked to invalidate a State’s law” because the federal court “risks friction-generating error”). More important, with that argument a part of the case, the Supreme Court of California might have made a special effort to construe the state constitution so as to avoid any potential conflict with federal constitutional law.

Fashion Valley resists this conclusion, contending “it would have been impossible for [it] to have presented, or for the Board to have resolved, U.S. Constitutional issues created by a decision which had not yet been issued.” But the decision of the Supreme Court of California did not inject a new constitutional issue into the case. The Board’s understanding of California law had been part of this case from the time the Board’s General Counsel filed the first brief before the Board; the Supreme *1381Court of California merely confirmed that the interpretation of California law long followed by the Board was correct. See, e.g., Glendale Assocs., 335 NLRB 27 (2001), enf'd, 347 F.3d 1145 (9th Cir. 2003); see also Robins v. Pruneyard Shopping Ctr., 23 Cal.3d 899, 153 Cal.Rptr. 854, 592 P.2d 341 (1979), aff'd, 447 U.S. 74, 100 S.Ct. 2035, 64 L.Ed.2d 741 (1980). Fashion Valley had no reason to wait until the Supreme Court of California rendered its decision to pursue its constitutional claim.

Therefore, without deciding whether Fashion Valley was required to raise its constitutional argument before the Board in the first instance, we hold the argument is forfeit because it was not timely raised before this court. Fashion Valley’s petition for review is accordingly denied and the Board’s cross-application for enforcement is granted.

So ordered.