LONDON (AP) — As Prime Minister Theresa May prepared her next move in Britain’s deadlocked Brexit battle, a senior opposition politician said Sunday that it’s unlikely the U.K. will leave the European Union as scheduled on March 29. A government minister, however, warned that failure to deliver on Brexit would betray voters and unleash a “political tsunami.”

May is due to present Parliament with a revised Brexit plan today, after the divorce deal she had struck the EU was rejected by lawmakers last week. With just over two months until Britain is due to leave the bloc, some members of Parliament are pushing for the U.K. to delay its departure until the country’s divided politicians can agree on a way forward. Labour Party Brexit spokesman Keir Starmer said “it’s inevitable” Britain will have to ask the EU to extend the two-year countdown to exit that ends on March 29.