LONDON—Prime Minister Theresa May’s Brexit plans were thrown into further turmoil on March 18 when the speaker of Parliament ruled that she could not put her divorce deal to a new vote unless it was re-submitted in a fundamentally different form.
In comments that blindsided May’s office, Speaker John Bercow said the government could not bring forward proposals for a vote in Parliament that were substantially the same as had already been defeated twice before, in January and on March 12.





