THE UK Parliament must vote on whether the UK can trigger Article 50 and begin the process of leaving the EU, the country’s High Court has ruled.
Prime Minister Theresa May has said the referendum result and ministerial powers mean MPs do not need to vote, but campaigners have said this is unconstitutional.
The government is expected to appeal the decision, with a further hearing to held in the Supreme Court.
If their challenge fails, Brexit could face months and months of parliamentary hurdles.
May had previously said she will trigger Article 50 by the end of March 2017.