MP Barry Gardiner has said a Parliamentary vote on Article 50 is necessary to force Theresa May and her government to set out their Brexit roadmap.
Yesterday the High Court ruled that Theresa May can't use prerogative powers to implement exit negotiations from the EU without Parliament's formal approval.
The Government is set to appeal the ruling in a hearing sceduled for early December.
Gardiner, the MP for Brent North and the Shadow International Trade Secretary, explained the vote was needed because Parliament needed to know the Government's priorities, and that Article 50 can't be triggered on the basis of incoherent plans.
Listen to the interview above.