London (CNN) Britain's embattled Prime Minister Theresa May has warned that a failure by lawmakers to back her Brexit deal risks the entire venture being canceled.

May has come under fire from huge sections of her own Conservative Party over her deal and is facing a revolt ahead of Tuesday's scheduled vote on her deal in the House of Commons.

But speaking to the Mail on Sunday , May insisted that if members of her own party were to rebel, it would leave the country in "uncharted waters."

"If you want Brexit, make sure you get it, and that's about this deal," she said.

"When I say if this deal does not pass we would truly be in uncharted waters, I hope people understand that this is what I genuinely believe and fear could happen. It would mean grave uncertainty for the nation with a very real risk of no Brexit or leaving the European Union with no deal."

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