May is expected to again submit the withdrawal deal to lawmakers next week, though it has already been rejected twice.
Later on, Wednesday (March 13th), the UK MPs voted down a no-deal Brexit option in any circumstances, proffering a breathing space for UK businesses which had been shifting their assets outside the UK in the fear of a no-deal Brexit, which would eventually prevent UK companies to conduct business with other eurozone nations.
That raises the extraordinary prospect of the Prime Minister even making a fourth attempt to win a majority for her withdrawal agreement with Brussels.
Open border was a major part of the peace agreement.
"She's been working tirelessly to deliver a deal and she will continue to do that", her spokesman said. But if no trade agreement is reached between the U.K. and the European Union by the end of the transition period, the backstop will come into force - a single customs territory between the European Union and the U.K. In that case, Northern Ireland will be bound by many European Union rules, and the U.K. can not leave the backstop without the EU's approval.
Her former policy chief George Freeman on Thursday became the first MP to break cover and suggest that a promise of her resignation could be the only way to persuade Eurosceptic MPs to back her deal.
Samuel Tombs, the chief United Kingdom economist at Pantheon Macroeconomics said on Twitter that it was "pretty clear" markets think Cox's legal advice didn't give enough cover for euroskeptic lawmakers to change tack.
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"Reasonable grounds for this (extension), would be to try to get these technical developments to make the backstop superfluous", Seif added, stressing that Britain would have to say what it wanted from an extension for it to be granted.
Any suggestion from European Union powerhouse Germany that Brussels should abandon its "sequencing" and switch to a form of talks more agreeable to London is likely to be seized on by May's opponents in Britain as an indication a better deal is possible if they hold out.
Or at any point Labour could call a vote of no confidence.
What is the way out?
In what pro-EU supporters said was a metaphor for his decision to walk away from the fallout of Brexit, Farage said he wouldn't be completing the full two-week walk to London but would instead join campaigners for about a third of it.
Unless an agreement is made, Britain is still at legal default to depart from the bloc on March 29.
The European Parliament's Brexit co-ordinator has cast doubt on the European Commission's desire to allow an extension to Article 50 while Parliament still appears to be in "deadlock".