UK ministers will outline how they want to overhaul trading arrangements between Britain and Northern Ireland that came into effect after Brexit.
The Northern Ireland Protocol helps prevent the need for checks on the island of Ireland’s internal border.
But Lord Frost says the deal – which could mean a ban on exports of British chilled meat and sausages to Northern Ireland – is unfair and unsustainable.
The Brexit minister will explain the government’s plans to Parliament later.
The protocol was negotiated with the EU by Lord Frost but he is expected to say its terms need to be radically changed.
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In particular, the government is worried about chilled meat products, including burgers and sausages, no longer being exportable from Great Britain (England, Scotland and Wales) to Northern Ireland, when the full terms of the deal are set to kick in at the end of September.
The UK is expected to warn the EU it is prepared to override the Brexit arrangements for Northern Ireland if a simpler agreement cannot be reached.
But it will not be triggering Article 16 of the protocol – which would allow it to suspend parts of the Brexit deal – “in the short term”, a government source said.