The High Court has ruled that Parliament must vote on whether or not the UK can start the process of leaving the EU.
The shock ruling comes after Prime Minister Theresa May previously announced that she would activate Article 50 before the end of March 2017.
If you're unsure of what Article 50 is, it's basically the beginning of talks with the EU to negotiate how the UK will leave.
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As it's never been done before, it's expected to be quite a complicated and lengthy process. In fact, once Article 50 has been triggered it could take up to two years for the UK to officially exit the EU.
Interestingly, the only reason that Article 50 was put into the Lisbon treaty in the first place was to silence British complaints that there was no official way out of the union.
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Campaigners are now saying that the ruling is unconstitutional. They probably have a point. It is expected that the government will appeal the ruling, reports the BBC.
A further hearing, which will take place at the Supreme Court, has been given the go-ahead and it should happen before the end of the year.
The thing is, even if it has to go to a vote, most MPs are expected to vote in favour of triggering Article 50 as the majority of the voters chose Brexit.
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