Robert Eugene Keling appeals his conviction and sentence for possession with intent to distribute cocaine. He concedes that the issue whether Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000) rendered 21 U.S.C. § 841 unconstitutional is foreclosed by United States v. Slaughter, 238 F.3d 580, 582 (5th Cir. 2000), and he raises that issue only to preserve its review by the Supreme Court. We are indeed bound by Slaughter absent an intervening Supreme Court decision or a subsequent en banc decision. See United States v. Short, 181 F.3d 620, 624 (5th Cir. 1999).

Keling additionally contends that the district court clearly erred in its finding that he was not entitled to a role adjustment under U.S.S.G. § 3B1.2. The record supports the district court’s finding that Keling was a key figure in transporting the cocaine. One month prior to his arrest, Keling purchased the car he was driving for the specific purpose of drug trafficking with monies he received from other participants in the offense; he registered the vehicle to the address of the Gateway Hotel in Laredo, Texas; and he was to be paid between $5,000 and $10,000 for his role in transporting roughly 70 pounds of cocaine from Mexico to Houston, Texas. Consequently, the district court’s refusal to find that he was a “minimal” or “minor” participant was not clear error. *686 See United States v. Leal-Mendoza, 281 F.3d 473, 477 (5th Cir. 2002).

AFFIRMED.