This educational guide is based on the linked primary sources. It is not a Court publication, is not affiliated with the Court, and is not legal advice.
In brief
Overview
MARIO CLAIBORNE v. UNITED STATES was argued before the Supreme Court.
Background and question before the Court
The case came on for oral argument before the Supreme Court at 11:19 a.m.
What each side argues
Petitioner (MARIO CLAIBORNE)
Petitioner argues that a sentence is reasonable if a reasonable judge would find it sufficient but not greater than necessary under 3553(a).
Petitioner says appellate review of reasonableness should look to the particular case and the reasons on the record.
According to Mr. Dwyer, petitioner contends that, based on the facts and record, the sentence was not sufficient but not greater than necessary.
Respondent (UNITED STATES)
The Government argues that reasonableness review should conform closely to Congress's original intent to minimize sentencing disparities.
According to Mr. Dreeben, mr. Dreeben asserts that courts of appeals are not sentencers except in very unusual circumstances.
What happened at oral argument
According to Chief Justice Roberts, chief Justice Roberts announced the hearing of 06-5618, Claiborne versus United States.
Justice Ginsburg asked: “What would be your test of reasonableness for appellate review?”
Justice Alito asked whether a court of appeals could ignore sentencing guidelines and base its decision solely on its own evaluation of the sentencing factors in the Sentencing Reform Act.
Justice Ginsburg asked whether the court could treat the defendant as though he possessed powdered cocaine.
Justice Kennedy asked whether the judge is permitted … (question about judicial authority).
Justice Stevens asked to what extent Congress’s purpose later than the statute being construed affects the case.
- [1] cbf0864cd5118d79e20b-r1-649672e658307151.pdf, p. 3
- [2] cbf0864cd5118d79e20b-r1-649672e658307151.pdf, p. 4
- [3] cbf0864cd5118d79e20b-r1-649672e658307151.pdf, p. 6
- [4] cbf0864cd5118d79e20b-r1-649672e658307151.pdf, p. 22
- [5] cbf0864cd5118d79e20b-r1-649672e658307151.pdf, p. 23
- [6] cbf0864cd5118d79e20b-r1-649672e658307151.pdf, p. 23
What the Court decided
Why it matters
Terms to know
No glossary terms are available for this guide.
Primary sources
Read the source materials on the official site or open the immutable repository copy used for this guide.
- cbf0864cd5118d79e20b-r1-649672e658307151.pdforal argument transcript
Guide generated September 22, 2026. Automated validation accepted this version.