British Prime Minister Theresa May warned lawmakers Sunday that failing to deliver Brexit would be catastrophic for democracy, in a plea for support two days before Parliament is expected to reject her deal with Brussels.

With the clock ticking down to its March 29 exit from the European Union and Parliament deadlocked, Britain faces a hugely uncertain path that could lead to a disorderly exit or even remaining in the bloc.

May, who postponed a vote in Parliament on her deal in December after admitting she was set to lose it, said lawmakers must not let down the people who backed Brexit in a June 2016 referendum.