court reviews his challenge for plain error. See United States v. Bisho, 629 F.3d 462, 468 (5th Cir.2010). Plain error exists when the appellant demonstrates that (1) an error; (2) that was clear or obvious; and (3) that affected his substantial rights. See Puckett v. United States, 556 U.S. 129, 129 S.Ct. 1423, 1429, 173 L.Ed.2d 266 (2009). If the first three prongs are met, we court will correct such an error only if it “seriously affects the fairness, integrity or public reputation of judicial proceeding entencing scheme permitting the prosecution to seek an enhancement potentially resulting in life imprisonment represents an unconstitutional delegation of authority to the executive branch of the federal government. See United States v. Rasco, 123 F.3d 222, 226-27 (5th Cir.1997) (<HOLDING>). Our analysis is in line with other circuit
holding that crimes subject to a minimum sentence of 15 years under 18 usc  924e1 are properly characterized as class a felonies under 18 usc  3559 holding constitutional the recidivismbased mandatory life sentence penalty created by 18 usc  3559 holding that a mandatory life sentence for cocaine possession is not unusual in the constitutional sense holding that the mandatory life sentence provisions of 21 usc  841b1 do not violate the eighth amendment holding life sentence mandatory under 21 usc  841b and district court could not depart from the mandatory life sentence unless government made a motion