Brexit Minister Lord Frost will present British calls for changes to the Northern Ireland Protocol in a confrontation with the EU this afternoon.
In a speech to the diplomatic community in Lisbon, Lord Frost is to warn that the protocol cannot survive without fundamental reforms.
The day comes before the EU announces its plans to resolve the problems with the Protocol that have created economic barriers between Northern Ireland and the UK.
The protocol aims to ensure that the border between Northern Ireland and the Republic remains open while protecting the internal market to which Northern Ireland remains a part.
However, the need for controls on the movement of goods from the rest of the UK to Northern Ireland has created growing tensions both within Northern Ireland and between London and Brussels.
The EU plan is likely to include a proposal that chilled meat may continue to cross the Irish Sea after the current grace periods have expired, in order to alleviate the so-called “sausage wars”.
Lord Frost is expected to argue that the changes must go much further if there is to be a sustainable solution.
Even before he gave his speech, the Irish government accused him of creating a “red line” to settle the dispute over post-Brexit trade deals.
Irish Foreign Minister Simon Coveney said Lord Frost was making demands that he knew the EU could not go on and asked if the UK really wanted to agree on a way forward.
We bring you live coverage of Lord Frost’s speech below. He is expected to start speaking at 3:30 p.m.