The WTO Appellate Body Crisis: How a Veto Paralysed Global Trade Governance

Background: How the Appellate Body Became Paralysed

The WTO was established in 1995 after the Uruguay Round to administer global trade rules and resolve disputes. Its dispute settlement system, created under the Dispute Settlement Understanding, relies on panels and an Appellate Body to deliver binding decisions. The Appellate Body comprises seven independent experts, with three members assigned to each appeal.

Under Article 2(4) of the DSU, all WTO members must agree to appointments. This consensus rule allows any member to block appointments. Between 2018 and 2019, the United States repeatedly exercised this veto, preventing the reappointment or replacement of Appellate Body members. As vacancies increased, the body could no longer meet Article 17.5 deadlines, which require reports to be circulated within sixty to ninety days.

The Appellate Body also operates under strict limits. It cannot review new evidence or reassess factual findings. In some cases, such as Guatemala and Peru (WT/DS457), the absence of undisputed facts prevented the Appellate Body from reaching a legal conclusion. These structural constraints, combined with the consensus requirement, contributed to the system's fragility.

How the Crisis Developed: The United States' Objections

The United States began raising concerns about the Appellate Body as early as 2016, but the crisis escalated in 2017. When two members approached the end of their terms, the United States opposed simultaneous reappointments and insisted on delaying one of them. This marked the beginning of systematic obstruction.

The United States later outlined six concerns about the Appellate Body's practices. These included delays beyond the ninety‑day deadline, the use of Rule 15 to allow outgoing members to complete appeals, the issuance of advisory opinions, the review of facts, the review of municipal law and the treatment of Appellate Body reports as precedent. Although some concerns highlighted ambiguities in the DSU, the United States did not propose concrete solutions.

By late 2018, the United States refused to support any DSU amendments and blocked routine reappointments. The last Appellate Body member's term expired in 2020, leaving the body with zero members.

Consequences: A System Without Enforcement

With no functioning Appellate Body, WTO dispute settlement cannot deliver binding appellate decisions. Appeals cannot be completed, and panel reports cannot be finalised if appealed. As a result, the legal enforceability of WTO rules has weakened significantly. Without an appellate mechanism, the system risks becoming guidance rather than binding law.

Proposed Solutions and Interim Measures

WTO members and legal experts have proposed several reforms. These include clarifying the scope of Appellate Body reports, limiting obiter dicta, revising Rule 15, improving transparency and reviewing the selection process. Some proposals suggest abolishing the veto power or adopting majority voting for appointments.

Article 25 arbitration has emerged as an interim solution. Canada and the European Union established an appeal arbitration arrangement to resolve disputes while the Appellate Body remains inactive. This demonstrates that alternative mechanisms can function, but widespread adoption remains uncertain.

Long‑term reform requires consensus among WTO members and constructive engagement with the United States. Without this, the Appellate Body cannot be revived.

Conclusion

The Appellate Body crisis has undermined the multilateral trading system's effectiveness. The absence of appellate review has weakened legal certainty, delayed dispute resolution and raised questions about the future of WTO enforcement. Reviving the system will require reforms to address procedural concerns, improve accountability and rebuild trust among member states. Collective action is essential to restore the integrity of global trade governance.