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09 Dec 2016  02:00GMT

GBP/USD - Reuters reported Britain's Supreme Court will decide as quickly as possible whether Prime Minister Theresa May can trigger Britain's exit from the European Union by the end of March without parliament's assent, its president said on Thursday.
Last month, the High Court decided that May could not invoke Article 50 of the Lisbon Treaty, the EU's exit clause, using executive powers known as the "royal prerogative".

The case could potentially hamper May's Brexit plans, and investors believe involving lawmakers would lessen the chances of a "hard" Brexit, where Britain gives up access to the single European market in order to impose tighter immigration controls.
Pro-Brexit critics have cast the legal battle as an attempt by a pro-EU establishment to thwart the result of June's referendum, when Britons voted by 52-48 percent to leave the EU.

The judges in the High Court case were dubbed "enemies of the people" by one newspaper while Gina Miller, the investment manager who brought the challenge, has received death threats and a torrent of online abuse.

The government's argument is essentially that under Britain's unwritten constitution, it can make or leave international treaties without parliamentary assent.
The challengers argue that triggering Article 50 would inevitably mean citizens would lose rights granted by parliament and so only lawmakers could take these away.

The Scottish and Welsh governments and lawyers for Northern Irish challengers all joined the case against the government. Scotland's nationalist executive, which opposes Brexit, argued that the Scottish parliament should be consulted.
If May wins, she can follow her planned timetable for invoking Article 50. If she loses, she might need to bring in a parliamentary bill, albeit one containing just a single line.

On Wednesday, parliament overwhelmingly voted to back a motion supporting her timetable, which government lawyer James Eadie said was highly significant and "legally relevant".
Echoing comments made by her lawyer to the Supreme Court on Wednesday, lead challenger Miller said she did not believe the motion in parliament had any bearing on the case.