Herman Killion pleaded guilty to bank robbery in violation of 18 U.S.C. § 2113(a). On appeal, Mr. Killion contests only his sentence. He submits that he should not have been considered a career offender under U.S.S.G. § 4B1.1 because the district court relied upon a prior conviction that he claims was the result of an unconstitutionally-wrought plea agreement. We disagree and, for the reasons that follow, we affirm the judgment of the district court.
I
When Mr. Killion pleaded guilty to the bank robbery charges on May 15, 1992, he and the government stipulated that he would be subject to a career offender enhancement under U.S.S.G. § 4B1.1 because he had been convicted of three prior violent felonies.
1
The parties also agreed, however, that Mr. Killion could challenge the constitutionality of any of the prior convictions used to enhance his sentence. Thus, in October 1992, Mr. Killion moved to preclude the district court’s use of two of his three prior violent felony convictions — a 1984 state court conviction for residential burglary and possession of burglary tools, and a 1986 state court conviction for residential burglary and robbery. He argued that the guilty pleas on which both of those convictions were based had not been voluntary and intelligent because he had not been fully informed of his constitutional rights as required by
Boykin v. Alabama,
II
On appeal, Mr. Killion submits that the district court erred in finding that his 1986 guilty plea satisfied the constitutional requirements for a valid plea agreement.
See id.; United States v. Colston,
We do not agree. First, the government could not have raised
Mitchell
in the district court — or even in this court — because
Mitchell
was decided on the day the government’s brief was due in this court. We therefore do not find the issue to have been waived. Second, in a recent decision on the application of the Supreme Court’s decision in
Custis,
we made, clear that the “ex post facto clause does not apply to judicial constructions of statutes.”
United States v. Burnom,
Finally, although our decision in
Mitchell
permits a collateral attack on any prior conviction “that is presumptively void — that is a conviction lacking constitutionally guaranteed procedures plainly detectable from a facial examination of the record,”
Mitchell,
In any event, the 1986 state court conviction is not one “that is presumptively void — that is a conviction lacking constitutionally guaranteed procedures plainly detectable from a facial examination of the record.”
Mitchell,
Conclusion
For the foregoing reasons, the judgment of the district court is affirmed.
AFFIRMED.
Notes
. In part, U.S.S.G. § 4B1.1 provides:
A defendant is a career offender if (1) the defendant was at least eighteen years old at the time of the instant offense, (2) the instant offense of conviction is a felony that is either a crime of violence or a controlled substance, and (3) the defendant has at least two prior convictions of either a crime of violence or a controlled substance offense.
