We’ve had help answering this question from our friends at the Institute for Government.
Only by tearing up a legally binding treaty (which is what the withdrawal agreement will be if it is agreed to by parliament and is finalised by the UK and EU).
This article is part of our Ask Full Fact series on Brexit, answering your questions about Brexit and the latest negotiations between the UK and the EU.
You can see all the questions we’ve answered so far here. If you want to ask us your own question, do that here.
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