The European Parliament has voted to seek a legal opinion from the Court of Justice of the European Union on the EU’s newly signed trade agreement with the South American Mercosur bloc, a step that could slow the ratification process and complicate plans for early implementation.
In a tight vote in Strasbourg on Wednesday, 21 January 2026, MEPs backed a motion to refer the agreement to the EU’s top court by 334 votes to 324, with 11 abstentions. The initiative was tabled by 144 lawmakers.
The EU and Mercosur members Argentina, Brazil, Paraguay and Uruguay signed the pact on Saturday after negotiations that have run, with interruptions, for roughly a quarter of a century. The European Commission has described it as the EU’s largest trade agreement by size of market, but it still requires approval before it can enter into force.
What the court would be asked to decide
The parliamentary motion asks the Court of Justice to clarify whether the agreement can be applied before full ratification by all EU member states, and whether parts of the text could constrain the EU’s ability to set environmental rules and consumer health policies. Under EU law, such opinions commonly take around two years, which is why opponents argue the referral could delay the deal significantly.
The dispute centres on legal architecture as much as on market access. Trade agreements that cover areas beyond the EU’s exclusive competence are typically treated as “mixed”, requiring national ratification in addition to approval at EU level. Supporters of the deal have argued for structures that would allow at least the trade component to be applied sooner; critics contend that the broader partnership elements make early application legally and politically problematic.
Provisional application remains possible, but politically fraught
Even if the case is referred, the Commission and member states could still decide to provisionally apply parts of the agreement while the court considers the questions, provided the necessary EU procedures are followed. However, the vote underlines the difficulty of moving ahead without provoking a further political clash, not least because the Parliament would retain leverage over the agreement’s final approval.
The Strasbourg vote took place against a backdrop of farmer mobilisation and sustained opposition in parts of the EU’s agricultural sector. Reuters photographs from the vote showed farmers gathered outside Parliament in Strasbourg, reflecting the extent to which the agreement has become a domestic political issue in several member states.
Agriculture and standards at the centre of EU opposition
France, the EU’s largest agricultural producer, has been the most prominent government critic, arguing that the agreement would increase imports of products such as beef, sugar and poultry and place European farmers at a disadvantage. Farming protests have repeatedly targeted the Mercosur talks in recent years, including demonstrations in Brussels during EU summits.
Opponents have also framed their case around regulatory autonomy, claiming the deal could weaken EU leverage on environmental protections and health standards by exposing future policy changes to dispute or by limiting room for stricter rules. The motion adopted in Strasbourg explicitly raises these questions for judicial review.
Supporters cite geopolitics and industrial supply chains
Backers of the agreement, including Germany and Spain, have argued that the EU needs additional trade corridors and raw-material supply lines as global commerce becomes more uncertain. They have linked their case to the trade disruption associated with US President Donald Trump’s tariff policy, and to a wider EU effort to reduce dependence on China by strengthening access to inputs including critical minerals.
They have also warned that Mercosur governments may be less willing to make further concessions after years of negotiation, and that delay risks undermining the EU’s credibility as a trade partner.
What happens next
The Parliament’s request would hand the Court of Justice a set of treaty-compatibility questions that could shape both the timetable and the structure for ratification. In practical terms, the key decision for the Commission and member states will be whether to attempt provisional application while the legal opinion is pending, or to wait for the court’s findings before advancing the agreement through the remaining steps.
Either approach leaves the EU facing a divided political landscape: sustained pressure from farming lobbies and some national governments on one side, and industrial exporters and trade-focused member states on the other. For Mercosur, the vote is an early indication that signature does not guarantee swift entry into force.
