Appealing the judgment in a criminal case, Jesus Lorenzo Contreras raises constitutional challenges to the imposition of a mandatory minimum sentence under 21 U.S.C. §§ 841 and 851 based on a prior conviction. As he concedes, his arguments are foreclosed by United States v. Keith, 230 F.3d 784, 787 (5th Cir. 2000), and United States v. Doggett, 230 F.3d 160, 166 (5th Cir. 2000), as well as by Almendarez-Torres v. United States, 523 U.S. 224, 243-47, 118 S.Ct. 1219, 140 L.Ed.2d 350 (1998). The Government’s motion for summary af-firmance is GRANTED, and the judgment of the district court is AFFIRMED.