Can Britain still stay in the EU?
Judges will today give their verdict on whether parliament needs to be consulted in the process of the UK quitting the EU.
The PM wants to see Article 50 triggered by March 2017.
Judges look to give their verdict by 10:00 GMT today. The losing side is expected to appeal to The Supreme Court, Britain’s highest judicial body.
The judgement will be decided by one of England’s top Judges, Lord Chief Justice John Thomas and two other senior judges, Master of the Rolls Sir Terence Etherton and Lord Justice Sales.
The government has persistently said they do not need parliament’s consultation to trigger Article 50.
Many MPs have argued they should get a vote before Article 50 is triggered, they’ve said the government doesn’t have the authorisation to decide the terms on Brexit.
One man who is calling for the vote is Lord Kerr of Kinlochard who wrote Article 50 told the BBC: “You can change your mind while the process is going on,”
“During that period, if a country were to decide actually we don’t want to leave after all, everybody would be very cross about it being a waste of time,”
“They might try to extract a political price but legally they couldn’t insist that you leave.”