
    UNITED STATES of America, Plaintiff-Appellee, v. Rigoberto ROBLERO-MEJIA, Defendant-Appellant.
    No. 06-8066.
    United States Court of Appeals, Tenth Circuit.
    Feb. 26, 2007.
    Darrell L. Fun, U.S. Attorney’s Office, Casper, WY, for Plaintiff-Appellee.
    Michael H. Reese, Michael Henry Reese, P.C., Cheyenne, WY, for Defendant-Appellant.
    Before TACHA, Chief Circuit Judge, MURPHY, Circuit Judge, and LUNGSTRUM, Chief District Judge.
    
      
      The Honorable John W. Lungstrum, Chief U.S. District Court Judge, District of Kansas, sitting by designation.
    
   ORDER AND JUDGMENT

MICHAEL R. MURPHY, Circuit Judge.

This matter is before the court on Rigoberto Roblero-Mejia’s response to this court’s order to show cause. In the order to show cause, we noted RobleroMejia pleaded guilty to a single count of illegal transportation of aliens in violation of 8 U.S.C. § 1324(a)(1)(A)(ii), preserving his right to appeal the denial of his motion to suppress. This court further noted that in denying Roblero-Mejia’s motion to suppress, the district court relied upon two alternative, but equally-sufficient, rationales: (1) the state trooper had inherent authority to enforce federal immigration laws and probable cause existed to arrest Roblero-Mejia for federal immigration violations; and (2) the state trooper had probable cause to arrest Roblero-Mejia for violations of Wyoming state law. Nevertheless, a close reading of Roblero-Mejia’s brief on appeal reveals he only challenges the district court’s conclusion that the state trooper had authority to enforce federal immigration laws, thereby waiving review of the district court’s alternative conclusion that the trooper had probable cause to arrest him for violations of Wyoming state law. State Farm Fire & Cas. Co. v. Mhoon, 31 F.3d 979, 984 n. 7 (10th Cir.1994) (holding that failure to raise an issue in opening appellate brief waives the issue). Finally, we noted in the show cause order that in like circumstances, this court has held that relief on appeal is foreclosed. Berna v. Chater, 101 F.3d 631, 633 (10th Cir.1996).

In his response to the order to show cause, Roblero-Mejia concedes he is only appealing the district court’s conclusion that the Wyoming Highway Patrol Trooper was entitled to enforce federal immigration laws. According to RobleroMejia, he is only appealing that issue because that is the real reason the Wyoming Highway Patrol Trooper detained him. As the Supreme Court has made clear, however, an officer’s “subjective motivation is irrelevant” to the question of whether a particular seizure was reasonable: “An action is ‘reasonable’ under the Fourth Amendment, regardless of the individual officer’s state of mind, as long as the circumstances, viewed objectively, justify the action.” Brigham City v. Stuart, — U.S. —, 126 S.Ct. 1943, 1948, 164 L.Ed.2d 650 (2006) (rejecting the argument that the reasonableness of a warrantless entry into a home turns upon the officer’s subjective motivation for entering) (internal quotations and brackets omitted). Thus, the particular reasons Trooper Mrzny chose to detain Roblero-Mejia are irrelevant. Instead, the question is whether, viewed objectively, an officer could have detained Roblero-Mejia for violations of Wyoming state law. Id.

The district court specifically concluded the facts, viewed objectively, demonstrated probable cause existed to detain Roblero-Mejia for violations of Wyoming state law. As Roblero-Mejia makes clear in his response to the order to show cause, he does not challenge that conclusion. Thus, even if this court were to rule in his favor on the question presented on appeal, he would not be entitled to relief because the district court’s judgment is supported by an alternative, unchallenged justification. Berna, 101 F.3d at 633.

For those reasons set out above, the order of the district court denying Roble-ro-Mejia’s motion to suppress is AFFIRMED. This matter is stricken from the oral argument calendar and counsel are excused from attendance at oral argument on Tuesday, March 6, 2007. 
      
       This order and judgment is not binding precedent except under the doctrines of law of the case, res judicata, and collatei'al estoppel. It may be cited, however, for its persuasive value consistent with Fed. R.App. P. 32.1 and 10th Cir. R. 32.1.
     
      
      . We further noted it could be argued that by proceeding to the merits of Roblero-Mejia’s appeal, this court would be offering up an advisory opinion. That is, even if this court were to rule in favor of Roblero-Mejia on the question actually presented on appeal, it would not affect his rights because the district court’s judgment is supported by an unchallenged, equally-sufficient rationale. Cf Preiser v. Newkirk, 422 U.S. 395, 401, 95 S.Ct. 2330, 45 L.Ed.2d 272 (1975) (holding that "a federal court has neither the power to render advisory opinions nor to decide questions that cannot affect the rights of the litigants in the case before [it]” (quotation omitted)).
     