What has John Bercow done now?

John Bercow told the government it cannot hold a third vote on Theresa May’s Brexit deal. Photograph: Reuters Tv/Reuters What did John Bercow rule out on Monday?He has told the government that it cannot send Theresa May’s Brexit deal back for a third vote in parliament immediately unless substantial changes are made to it. What is Bercow’s reasoning for his ruling?He has based his decision on Erskine May, the official parliamentary rulebook. This work was begun by Thomas Erskin