The legal challenge to Brexit is today being heard in the Supreme Court. 11 of the UK's most senior judges will decide if Theresa May can trigger Article 50 without MPs voting on the mechanism.
Here are the latest updates:
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Today's hearing is an appeal brought by the Government, in response to the High Court ruling last month against the Prime Minister's Brexit plans. The Court ruled parliament must approve triggering Article 50, the process by which the UK begins withdrawal from the European Union following the referendum result which saw Britain vote to leave.
The judges' decision derailed Ms May's proposal that she would trigger Article 50 this Spring. If the same decision is upheld by the Supreme Court this week, it is expected to be a major blow to her authority and could considerably delay Brexit.
If MPs are granted the opportunity to vote on triggering Article 50, it is unlikely that the bill would be defeated due to the expectation MPs must respect the national vote. However, some MPs could insist on toning down aspects of a 'hard Brexit', to reduce it's impact.
The case is expected to last four days, concluding on Thursday. The judgment is expected early in the New Year.