The UK and EU are holding emergency talks in London on Thursday over legislation which could override parts of the Brexit Withdrawal Agreement.
The UK says it's necessary as a contingency if no trade deal is reached with the EU.
But Brussels says trust has been damaged, as talks on that trade deal also continue in London.
A Brexit transition period concludes at the end of this year, by which time both sides had said they wanted a trade agreement in place.
Jessica Sargeant of The Institute for Government says the UK is employing a deliberate tactic.
IN: "Certainly...
OUT: ...these areas."
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