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Court review of arbitration awards

United Mexican States v. Lion Mexico Consolidated

Updated Nov 12, 2026

In brief

Where it stands
Petition Pending

Awaiting an order on the petition

No decision timeline until the Court agrees to hear the case.

What it’s about
The United Mexican States asks the Supreme Court to review a dispute with Lion Mexico Consolidated L.P. over when a court may set aside an arbitrator’s decision for lacking support in the contract. Mexico argues that the D.C.
What's at stake
Whether the award in Mexico and Lion’s dispute can be set aside under the test Mexico challenges remains unresolved.

Summary: written with AI from the case record.

What it's about

Circuit used a test that asks only whether the arbitrator purported to interpret the agreement.

The Federal Arbitration Act lets a court set aside an arbitration award when the arbitrator goes beyond the powers given by the agreement.

Question presented

Whether arbitrators have “exceeded their powers” under 9 U.S.C. § 10(a) when the award has no plausible basis in the governing instrument.

What happens next

The next step is for the Court to decide whether to hear the case. No argument or decision window is set before the Court agrees to review it.

Documents

1

Docket activity

9
  • New analysis added

    Nov 12, 2026 · Court records

  • AI analysis generated: Case Briefing

    Nov 12, 2026 · Generated

  • Case data updated: summary, question_presented, generation_metadata

    Nov 12, 2026 · Court records

  • Case data updated: question_presented, extraction_metadata

    Nov 12, 2026 · Court records

  • New document added

    Nov 9, 2026 · supremecourt.gov

Show 4 more
  • Case data updated: documents, description, document_url, proceeding_type

    Nov 6, 2026 · supremecourt.gov

  • New document added

    Aug 26, 2026 · supremecourt.gov

  • Case data updated: documents, description, document_url, proceeding_type

    Aug 25, 2026 · supremecourt.gov

  • Brief added: Petition

    Aug 5, 2026 · Court records

More questions

1
What test does Mexico challenge?
Mexico says the D.C. Circuit asks only whether the arbitrator purported to interpret the agreement, rather than whether the award has a plausible basis in it.

Sources

Primary materials plus reporting. Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.

Checked Nov 12, 2026Methodology

Court records and filings

Reporting and analysis