Liberal Democrats leader Tim Farron has called for another EU referendum
Tim Farron, the leader of the Liberal Democrats, said his party will oppose Article 50 unless the final deal is put to a public vote.
Mr Farron said: "I welcome today's judgment. But this court case was never about legal arguments – it was about giving the people a voice, a say, in what happens next.
"This Tory Brexit Government are keen to laud the democratic process when it suits them, but will not give the people a voice over the final deal.
The Liberal Democrats are clear – we demand a vote of the people on the final deal and without that we will not vote for Article 50
"They seem happy to start with democracy and end in a stitch-up.
"The Liberal Democrats are clear – we demand a vote of the people on the final deal and without that we will not vote for Article 50."
Mr Farron's party has have nine MPs and more than 100 peers prepared to vote against triggering Article 50 to start the two year formal process of Britain leaving the EU.
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Continued cooperation with the EU to tackle terrorism and international crime.
Mr Farron has repeatedly led the charge for Remain and has attempted to set up the Liberal Democrats as the “real voice of opposition” after Mr Corbyn confirmed Labour would back the Tories in triggering Article 50.
The Lib Dems say party membership is now at its highest this century at more than 80,000 with 2016 being the best year for membership growth since the party was founded and continues to rise.
The greatest potential threat to Theresa May’s plans to trigger Article 50 by the end of March comes from the House of Lords, where many peers remained strongly opposed to Brexit and do not have voters to worry about.
If the Lords were to vote against approving the triggering of Article 50, the Brexit timetable could be severely delayed.
Labour leader Jeremy Corbyn said his party would not "frustrate the process for invoking Article 50" but would seek to amend the legislation to prevent the UK becoming a "bargain basement tax haven".
By a majority of eight to three, Supreme Court judges ruled the Prime Minister must get parliament's approval before she begins Britain's formal exit from the EU.
The UK's highest judicial body dismissed the government's argument that Mrs May could simply use executive powers known as "royal prerogative" to invoke Article 50 of the EU's Lisbon Treaty and begin divorce talks.
But the Supreme Court boosted the Government by ruling devolved parliaments in Scotland, Wales and Northern Ireland do not need to vote on Article 50 before Brexit can begin.
The verdict represents a major blow to Scottish First Minister Nicola Sturgeon's fight against her country being taken out of the EU.
Ministers are now expected to publish a short bill authorising the invocation of Article 50, with votes to take place in the Houses of Commons and Lords soon.
Attorney General Jeremy Wright – who led the Government's legal fight – said ministers were "disappointed" by the ruling, but added: "The Government will comply with the judgment of the court and do all that is necessary to implement it."
A Downing Street spokesman said: "The British people voted to leave the EU, and the Government will deliver on their verdict – triggering Article 50, as planned, by the end of March. Today's ruling does nothing to change that.
"It's important to remember that Parliament backed the referendum by a margin of six to one and has already indicated its support for getting on with the process of exit to the timetable we have set out.
"We respect the Supreme Court's decision, and will set out our next steps to Parliament shortly."
More to follow…