Legislation giving ministers power to scrap parts of the NI Protocol is due to be published in the House of Commons on Monday afternoon.
Ahead of the publication, Foreign Secretary Liz Truss is expected to speak to European Commission vice-president Maros Sefcovic.
British Secretary of State Brandon Lewis has said he is confident the changes would be lawful.
He also said he expected the DUP to form an executive after publication.
But DUP MP Sammy Wilson said it was “impossible” to make a judgement call until the party had seen the final draft of the legislation.
He said the DUP had “been told bits and pieces of what is there” but it had been “a changing feast all week”.
The protocol keeps the North of Ireland inside the EU’s single market for goods.
It has been a contentious element of the Brexit treaty, which was signed by the UK and the EU in January 2020.
A row over its impact has created a block on forming a devolved government in the North of Ireland, with the DUP stopping the assembly from sitting or a new executive being formed since Sinn Féin emerged as the largest party in May’s election.
The new legislation is expected to aim to remove checks on goods arriving into Northern Ireland from Great Britain, that are destined to remain there.
Under the plans, there would be a dual regulatory regime established, allowing businesses in Northern Ireland to chose between sticking to either EU or UK standards, as well as UK VAT and state aid rules applying in Northern Ireland.
It is also expected there would be a more limited rule for the European Court of Justice.
On Sunday, RTÉ reported that the Republic’s foreign affairs minister said he believed the legislation threatened the relationship between the UK and Irish governments.
“My message to the UK government is this is a mistake, and to move away from unilaterally introducing legislation which breaches international law,” said Simon Coveney.
He added that instead Britain should “come to the negotiating table where they will have a willing partner in the EU and in Ireland” to solve outstanding issues.
Alliance Party deputy leader Stephen Farry MP described the legislation as being “contrary to the interests of Northern Ireland”.
He said the government had taken a “belligerent and begrudging approach” which had been a major obstacle.
SDLP leader Colum Eastwood accused the government of acting “in bad faith”.
“The reality is the protocol is working, it is working very well for businesses here,” said the Foyle MP.
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