Legislation which will override the Northern Ireland Protocol section of the post-Brexit deal that the UK agreed with the EU does not breach international law, the government has insisted.
But the controversial bill, which has just been introduced to parliament, has been heavily criticised by senior EU figures.
The bill to amend the protocol unilaterally will allow changes to the mechanism which Boris Johnson says will make it easier for goods to pass between Great Britain and Northern Ireland.
Foreign Secretary Liz Truss has insisted the UK government “is acting under international law”.
“We are changing the protocol, we are not getting rid of the protocol. I think that is important to acknowledge,” Ms Truss told broadcasters.
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“We have to take the actions to protect the people across the United Kingdom, we have to take the actions to protect peace and stability in Northern Ireland – and that is exactly what we are doing.”
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The foreign secretary also disputed that the legislation may not be triggered and is being used for negotiating purposes, adding: “We are completely serious about this legislation.”
But despite the PM earlier calling the suggested protocol changes “trivial” and “not a big deal”, senior EU figures have warned of the damage they could cause and have hinted at possible legislative action to prevent them.
An EU source has told Sky News that Brussels will restart legal proceedings against the UK over breaching the Brexit withdrawal treaty of 2020.
Maros Sefcovic, European Commission vice-president, will make a statement after the UK government tables the legislation in parliament, having told the foreign secretary on Monday morning that the decision to unilaterally override the agreement was “damaging to mutual trust and a formula for uncertainty”.
Meanwhile, a spokesman for Ireland’s foreign minister Simon Coveney said the bill “marks a particular low point in the UK’s approach to Brexit” and said the plan would “ratchet up” tension and breach the UK’s international commitments.
Elsewhere, a majority of MLAs in the Stormont Assembly signed a joint letter to Mr Johnson stating their opposition to proposed legislation to amend the Northern Ireland Protocol.
But the PM has insisted the legislation would introduce “relatively simple” changes and said it would be a “gross overreaction” by the EU if they sought to retaliate by triggering a trade war.