A Historic First in Strasbourg
On 21 January 2026, the European Parliament did something it had never done before: it voted to refer a trade agreement to the Court of Justice of the European Union.
334 for. 324 against. 11 abstentions. A margin of 10 votes.
The target: the EU-Mercosur Partnership Agreement, the largest trade deal the EU has ever negotiated. The legal basis: Article 218(11) TFEU — Parliament's right to request the Court's opinion on whether an envisaged agreement is compatible with the Treaties. Never before has this mechanism been triggered for a trade deal.
The legal trigger
Article 218(11) of the Treaty on the Functioning of the EU:
'The European Parliament may, before concluding an agreement, obtain the opinion of the Court of Justice as to whether an agreement envisaged is compatible with the Treaties.'
Parliament is not blocking the deal. It is asking the Court whether the deal is legal. But the consequence is clear-cut: Parliament cannot give consent until the Court delivers its opinion. Ratification is on hold.
What will the Court examine?
Based on the parliamentary resolution and procedural documents, the CJEU will address three core questions.
1. Competence: EU-only or mixed?
The Commission wants to split the agreement into two instruments: an Interim Trade Agreement (ITA) falling under exclusive EU competence — which can be provisionally applied without national parliaments — and an EU-Mercosur Partnership Agreement (EMPA) classified as mixed.
There is precedent. In Opinion 2/15 of May 2017, the Court ruled that the EU-Singapore trade agreement could not be concluded by the EU alone, because provisions on portfolio investment and investor-state dispute settlement fell within shared competence. The question now: does the same logic apply to the ITA/EMPA split in the Mercosur deal?
2. Climate commitments
Article 18.6 of the EU-Mercosur agreement commits both sides to implementing the Paris Agreement:
'The Parties recognise the importance of pursuing the ultimate objective of the UNFCCC, in order to address the urgent threat of climate change [...] each Party shall effectively implement the UNFCCC and the Paris Agreement.'
Parliament wants to know: are these provisions enforceable? Can Mercosur countries violate them without consequences? Is the absence of a sanctions mechanism for climate non-compliance compatible with the EU's own treaty obligations?
3. Deforestation and the EUDR
Article 18.8 of the agreement addresses "sustainable management of forests" and cooperation to combat illegal logging. Parliament questions whether these general commitments are consistent with the EU Deforestation Regulation (EUDR), which imposes specific obligations on importers. Brazil and Argentina are the world's leading exporters of soy and beef — products covered by the EUDR.
How did the factions vote?
The vote cut across traditional political lines. Data from HowTheyVote.eu and Politico:
| Group | Position | Note |
|---|---|---|
| EPP (centre-right) | Split | Internal tensions between pro-business and pro-agriculture wings |
| S&D (social democrats) | Majority for referral | Environmental and social justice arguments |
| Renew (liberals) | Split | Pro-business wing against, others for |
| Greens/EFA | Strongly for | 12 German Greens supported the deal itself but voted for CJEU review |
| ECR (conservatives) | Majority for | Driven by agricultural protection |
| Patriots for Europe | For referral | Opposition to free trade |
| The Left | Strongly for | Environmental and labour standards |
The result: the ecological left and the nationalist right voted the same way — for entirely different reasons. Environment versus farm protection. Two poles, same outcome.
How long will it take?
Historical precedents:
- Opinion 2/15 (Singapore): requested July 2015, delivered May 2017 — 22 months
- Opinion 1/17 (CETA): requested September 2017, delivered April 2019 — 19 months
Realistic timeline for EU-Mercosur: opinion in the second half of 2027 or early 2028.
Does this block provisional application?
This is the hottest legal controversy.
The Commission argues that Article 218(11) refers to "concluding" an agreement, not to provisional application. The CJEU referral blocks ratification but not temporary application under a separate legal track.
Some MEPs insist that provisionally applying an agreement while the Court is examining its treaty compatibility would be legally and politically irresponsible.
Sabine Weyand, Director-General of DG Trade, publicly assured Parliament that the Commission "does not intend to circumvent Parliament" — but did not rule out provisional application.
The Parliament's own Legal Service has not published a definitive opinion. Academic lawyers are divided.
What comes next?
The EP's decision does not permanently close any doors. If the CJEU delivers a positive opinion, the agreement returns to the ratification track. If negative — the text will need amendments.
Meanwhile, the Commission is examining whether it can launch provisional application independently of the Court proceedings.
Sources: europarl.europa.eu (21 Jan 2026), Politico.eu, HowTheyVote.eu, AP News, Euractiv, CJEU (Opinion 2/15, 2017; Opinion 1/17, 2019). Treaties: Art. 218(11) TFEU. EU-Mercosur Agreement: Art. 18.6 (climate), Art. 18.8 (forests).
“The European Parliament may, before concluding an agreement, obtain the opinion of the Court of Justice as to whether an agreement envisaged is compatible with the Treaties.”
— Treaty on the Functioning of the EU, Article 218(11) TFEU