With Johnson facing another crunch week in Britain’s ongoing Brexit saga, and after the prime minister hammered out a deal with the European Union, Bercow could refuse to allow the vote because rules generally bar considering the same measure for a second time during the same session of Parliament unless something has changed.

Bercow — who is known for his efforts to impose calm on the tumultuous chamber with bellows of “Order! Order!” — said on Saturday that he was blindsided by the government’s debate proposal.

Bercow is scheduled to make a statement shortly after Parliament opens at 2:30 p.m (9:30 a.m. ET).