The European Union is starting legal action against the UK.
It's over how the Brexit deal is being implemented.
Last week the UK - without consulting Brussels - pushed back the date that full checks, on things like supermarket supplies and parcel deliveries, need to be brought in for Northern Ireland.
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Foreign Affairs Minister Simon Coveney says the approach of the UK government has given the EU no alternative but to take action.
British Prime Minister Boris Johnson has defended his government's approach.
