Theresa May has said the UK would be in “uncharted territory” if MPs reject her Brexit deal next week, as she refused to rule out bringing the deal back to Parliament multiple times.

A vote on the deal is now earmarked for the week starting January 14, after the prime minister postponed it in December because she risked almost guaranteed defeat.

Speaking on Sunday, she was adamant that the Commons vote on her Brexit deal would “definitely” go ahead next week.

Questioned on whether she would continue to put the deal back to MPs if it is rejected, Mrs May told the BBC’s Andrew Marr Show: “If the deal is not voted on at this vote that’s coming up, then actually we’re going to be in uncharted territory.”

“I don’t think anybody can say exactly what will happen in terms of the reaction we will see in Parliament.”

Mrs May said she would seek to avert defeat in the vote by securing new reassurances for Northern Ireland, a greater role for UK parliamentarians in forging the future relationship with the EU and further pledges from Brussels.

Mrs May is seeking legally binding assurances that a so-called backstop plan — intended to avoid a hard Irish border, based on proposals for a temporary UK-EU customs union — will be time-limited.

She acknowledged on Sunday that “we are still working on” securing these assurances from the EU.

Downing Street will seek to win over critics who have vowed to rebel against Mrs May’s deal this week, by highlighting the dangers posed by a no-deal Brexit or a second referendum.

Asked to rule out a second referendum, Mrs appeared to soften her stance, saying it was her personal view that a second vote would divide the country. “In my view there should not be a second referendum”, she told the BBC.

In a message to Labour MPs and Conservative Eurosceptics who have vowed to vote down her deal, Mrs May said: “We have got people who are promoting a second referendum in order to stop Brexit, and we have got people who want to see their perfect Brexit.”

“I would say don’t let the search for the perfect become the enemy of the good because the danger there is that we end up with no Brexit at all.”

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