France’s Senate has voted to reject the Mercosur free trade agreement between the European Union and South American countries, following a similar vote in the National Assembly, as farmers continue to protest against a deal they say would bring unfair competition.

Poland opposes the EU-Mercosur free trade deal with South American countries in its current form, the prime minister said on Tuesday, joining France in standing against an agreement European farmers say will expose them to unfair competition.

Polish Prime Minister Donald Tusk said he wanted to send a “political message” that Warsaw could not accept the current terms of a trade deal that would hurt its agricultural sector. Poland is the EU’s biggest poultry producer.

The European Union and four Latin American countries are preparing for a final push to clinch a controversial free trade deal that has been under discussion for 25 years. Backed by Germany and Spain,