The Prime Minister has admitted that "no one knows" what will happen if her Brexit plan is defeated by MPs next week.
Delivering a speech in the Leave-voting town of Grimsby, Theresa May said there was the possibility that the UK "may never leave" if her Withdrawal Agreement is not supported in the Commons on Tuesday.
"Next week, MPs in Westminster face a crucial choice: Whether to back the Brexit deal or to reject it," she said.
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"Back it and the UK will leave the European Union. Reject it and no one knows what will happen.
"We may not leave the EU for many months, we may leave without the protections that the deal provides. We may never leave at all."
Ms May is currently urging Brussels to give ground on the Northern Ireland backstop arrangement in order to help her deal get through.
'Sign of desperation'
Labour leader Jeremy Corbyn called the speech a sign of 'desperation'
In a plea to Brussels for support, she said what the European Union does over the next few days "will have a big impact on the outcome of the vote".
However, Labour leader Jeremy Corbyn said the speech was a "sign of desperation", and promised to oppose the deal again on Tuesday's vote.