Constitutional crisis as Speaker tells MPs he could block third Brexit vote

Theresa May’s attempt to get parliament to agree to her Brexit deal suffered another major setback today, after the Commons Speaker said he might stop the government from calling another meaningful vote.

John Bercow told MPs he would not allow Theresa May to ask the Commons to vote a third time if the motion hadn’t changed.

The announcement took the government by surprise and means it’s increasingly likely that Theresa May will ask this week’s European summit for a long extension to Britain’s exit date.