The Government goes to the Supreme Court on Monday in a bid to appeal a controversial Brexit court ruling.
Britain’s most senior judges are being asked to overturn a High Court ruling made last month stating the Prime Minister must allow Parliament to vote before triggering Article 50.
The ruling infuriated Brexiteers who believed the ruling could give MPs a chance to block the process of Britain leaving the EU.
Now 11 Supreme Court justices - a record number to sit on an appeal - will listen to government lawyers try to appeal the ruling.
If the appeal is unsuccessful, and any potential further appeal to the European Court of Justice in Luxembourg also fails, the Government's plans for Brexit could be thrown into disarray.
The Supreme Court has already stressed that its judges will only be concerned with questions of law and not making political decisions.
The High Court ruling was won by Gina Miller, 51, an investment fund manager and philanthropist who was selected to bring the case.
The Attorney General said: "The country voted to leave the European Union in a referendum provided for by an Act of Parliament.
"The Government is determined to respect the result of the referendum.
"The Government's case is that it does have legal power to trigger Article 50 on the timetable set out by the Prime Minister. We do not believe another Act of Parliament is necessary."
Additional reporting by Press Association.
