The government must consult parliament before invoking Article 50, the High Court has ruled.
The court ruled that Prime Minister Theresa May does not have the authority to use the Royal Prerogative to invoke the EU divorce process.
The Lord Chief Justice has ruled that the government’s arguments are “contrary to fundamental constitutional principles of the sovereignty of parliament”.
He added: “The court does not accept the argument put forward by the government. There is nothing in the text of the 1972 Act to support it.”
Lord Chief Justice, Lord Thomas, sitting with the Master of the Rolls, Sir Terence Etherton, and Lord Justice Sales, delivered the verdict Thursday morning after a three-day hearing in October.