More than 1,000 farmers will protest outside the Dáil today against the Mercosur deal.
Bus loads of farmers are travelling from across the West for today's protest.
The deal would see up to 99-thousand tonnes of beef enter the EU from South America every year - leading to concerns about its impact on Ireland's beef sector.
In the Dáil today, Sinn Féin will call for the deal to be rejected while the Beef Plan group will protest outside.
The organisation's David Whelehan says the trade agreement would be a disaster for beef farmers and for rural Ireland.