Plead Broadly, Protect Narrowly? First Majestic and the Strategic Cost of Defining the Dispute

A request to stay enforcement may look one step removed from the measure challenged on the merits. First Majestic Silver v Mexico shows why that sequence can be deceptive. Under NAFTA Article 1134, a tribunal may grant interim protection but may not order attachment or ‘enjoin the application’ of the measure alleged to constitute the breach. The real problem is one of legal identity: when is enforcement a downstream act that may be restrained, and when is restraining it simply another way of suspending the challenged measure itself? This post argues for a four-stage answer: identify the pleaded measure, test objective continuity, ask whether the later act has materially transformed, and examine the legal effect of the relief sought.

First Majestic puts the pleadings first. The contrast between the tribunal’s two provisional-measures decisions is unusually instructive. On 26 May 2023, the tribunal recommended that Mexico not block VAT refunds owed to the claimant’s Mexican subsidiary, PEM. Article 1134 did not prevent that protection because denial of free access to future VAT refunds was not a measure challenged in the Request for Arbitration or discussed in the Memorial.

On 29 January 2026, the result was the opposite. First Majestic asked the tribunal to suspend measures compelling payment related to the 2012 tax reassessment. The tribunal compared the object of that request with the measures pleaded on the merits. Those pleadings already attacked unlawful retroactive reassessments, efforts to collect them, unlawful collection methods and refusal to suspend collection. The requested stay therefore sought to suspend a measure the claimant itself described as ‘at the core’ of the dispute. Article 1134 barred the relief.

The implication is easy to miss. The breadth with which a claimant defines the challenged measure on the merits can later narrow the space available for interim protection. The interim-measures inquiry is therefore not insulated from pleading strategy.

The 2026 decision also contains an important conceptual correction. Mexico characterised the obstacle as jurisdictional. The tribunal observed that it might more accurately be described as a lack of authority to grant the particular provisional measure notwithstanding prima facie jurisdiction over the dispute. On that formulation, Article 1134 is best understood as a treaty-based limit on remedial authority, not necessarily as a denial of adjudicative jurisdiction over the underlying claim.

The cases contain the pieces, not the sequence

Leading commentary has long treated Article 1134 as a treaty-specific limit on interim relief. The harder identification problem has emerged through the cases.

In IBT Group v Panama, interpreting the similarly worded Article 10.20(8) of the US-Panama Trade Promotion Agreement, the tribunal asked whether the requested relief would prevent or suspend implementation of the allegedly wrongful measure. It made the answer depend on the particular facts and on how close or remote the causal chain was between the challenged measure and the act sought to be restrained. The bond execution and debarment were immediate consequences of the administrative termination decision; suspending them would therefore suspend its application.

Amec Foster Wheeler v Colombia supplies a different piece. The tribunal treated forced collection as part of, and the culmination of, the fiscal-liability proceeding rather than as a separate recovery mechanism. It was careful, however, not to decide finally whether Article 10.20(8) itself barred the requested relief on that basis alone.

Read together, these authorities do not support a claim that continuity is new. They reveal separate analytical tools—pleading identity, causal proximity and integrated-process analysis. First Majestic sharpens the first. What remains useful is to put the tools in the right order.

A four-stage test

A disciplined approach can be stated in four stages.

1. Claim identification. What measure, precisely, has the claimant pleaded as constituting the treaty breach? The answer should come from the operative pleadings, not from labels introduced at the interim-measures stage. This anchors the inquiry in the claimant’s own case.

2. Objective continuity. Is the later enforcement act a direct juridical or causal implementation of that pleaded measure? Relevant indicators include whether the original act legally mandates the later step, whether the later act merely operationalises an already-fixed obligation, and how attenuated the causal chain has become.

3. Material transformation in character or scope. Even where continuity exists, has the later act acquired a materially different legal basis, object, scope or consequence? Fresh decision-making or discretion may be relevant, but only as an indicator. The question is whether the later act has become legally distinct, not merely chronologically subsequent.

4. Effect of the requested relief. Finally, what would the interim order actually do? This is separate from continuity. Would it preserve evidence, procedural integrity or a collateral right, or would it in practical and legal effect suspend application of the very measure challenged on the merits?

The sequencing matters. Claim identification prevents a respondent from treating every downstream consequence as automatically immune from interim relief. The effects inquiry prevents a claimant from escaping the treaty restriction merely by relabelling a merits-facing injunction as a ‘stay of enforcement’.

Why the distinction now matters

The issue is already travelling. In Finley Resources v Mexico in May 2026, Mexico relied on First Majestic to argue that the requested relief would violate Article 1134. The tribunal did not reach that issue because it dismissed the request for lack of convincing proof of irreparable harm. The architecture is also not confined to legacy NAFTA: CETA Article 8.34 likewise prohibits a tribunal from ordering attachment or enjoining application of the measure alleged to constitute the breach.

The practical lesson is therefore sharper than ‘form should not prevail over substance’. The tribunal must first identify the measure that the claimant actually put in dispute, then determine whether the later act remains its application, whether anything legally material has changed, and what the requested order would do. First Majestic’s deeper lesson is strategic as well as doctrinal: the way a claimant defines the merits can later define the boundary of interim relief.

Ahmed Gamal Eldin Hamed Ibrahim is a Judge in the Egyptian Judiciary and holds a PhD in Law from Alexandria University.

The views expressed are personal and do not represent the Egyptian Judiciary.