Court concludes that, by its terms, § 3582(c)(2) does not authorize a sentencing/resentencing proceeding. The section provides for the modification of a term of imprisonment---it gives courts the power to reduce an otherwise final sentence in the circumstances the Commission specified.
Majority does not respond to the dissent's separation-of-powers discussion because that issue was not encompassed in the questions presented and was not briefed.
Section 3582(c)(2) proceedings do not implicate the Sixth Amendment right to a jury finding of essential facts. Rejects Hicks reasoning.
Because 3582(c)(2) does not permit resentencing, correcting other sentencing errors is beyond the scope of such a proceeding.
Justice Stevens closes his dissent: "I had thought Bookerdismantled the mandatory Guidelines regime. The Court ought to finish the job."