The EU's announced fresh legal action against the UK - after it set out plans to change part of the Northern Ireland protocol.
On Monday, the British government published legislation which'll override the post-Brexit trade deal.
British Prime Minister Boris Johnson insisted making changes are legal - and it's about fixing current issues.
But the European Commission vice president Maros Sefcovic doesn't agree- he says the UK government had set out to "unilaterally break international law".
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