Eurosceptics in May's Conservative party and the Northern Irish party that props up her government hate the provision in the Brexit deal created to keep open the border with Ireland - the so-called backstop.
May spoke over the weekend to European Council President Donald Tusk - who will chair an EU summit in Brussels on Thursday - and European leaders including Irish Prime Minister Leo Varadkar, amid signs she was seeking to tweak the deal to win over skeptical lawmakers.
With EU officials adamant the withdrawal deal is not up for renegotiation, May's move threw Britain's Brexit plans into disarray, battered the pound and intensified the country's political crisis.
But last minute revelations seem to have scuppered the Prime Minister's plans.
MPs could give Mrs May "a powerful mandate to change that backstop" by voting it down on Tuesday, he said.
But as opposition MPs shouted "resign" at May, Labour leader Jeremy Corbyn said: "The government has lost control of events and is in complete disarray".
Downing Street insisted that the vote would still go ahead on Tuesday amid speculation she might be forced to delay the showdown.
May has been trying to find some kind of modifications to the Brexit deal that could appease her many critics.
European Union leaders signaled they are prepared to help Britain, up to a point, but insisted the Brexit agreement could not be changed. "So the government will step up its work in preparation for that potential outcome", she told parliament.
Grace Millane: Body found in backpacker murder probe The detective appealed for anyone who saw the auto in the west Auckland area between 6.30am and 9.30am on Monday to come forward. Before she vanished, Millane had been staying at a backpacker hostel in Auckland, and she left some of her belongings there.
Late in November of this year, May returned from Brussels with a withdrawal settlement and a blueprint for future relations after two years of negotiations with European officials.
That could be a problem for May in Parliament, though she could argue with some conviction that with a Norway-style deal as the final destination, the backstop would nearly certainly not be needed.
Guy Verhofstadt, the European Parliament's Brexit Coordinator, tweeted: "I can't follow anymore".
Britain invoked Article 50 of the EU's Lisbon Treaty in March 2017, triggering a two-year exit process.
A person dressed as British Prime Minister Theresa May at a "Brexit Fudge" pop-up shop organised by pro-Europe activists Best for Britain outside the Houses of Parliament yesterday.
A heavy defeat would sink the agreement, leaving the United Kingdom facing a messy "no-deal" Brexit when it leaves the bloc on March 29, and could topple May and her government. Just keep in mind that we will never let the Irish down.
The timing of the ruling on the eve of the British parliamentary vote was no coincidence - the court said it had ruled with unprecedented haste to ensure that British lawmakers would understand their options. Crucially, Britain could only do this if an exit deal hadn't already been agreed upon.
"Without change [May's deal] jeopardizes the control of our money, our borders, our regulatory independence and our constitution too", said the Conservative MP and former Brexit Secretary David Davis.
Adding another twist to the scenario, the European Court of Justice-the bloc's top court-determined that it would be legal for the U.K.to cancel Brexit altogether without requesting the permission of the rest of the EU.
Maryury Serrano Hernandez, 19, told the network giving birth in the US was a "big reward" for the family's grueling journey. Customs and Border Protection Commissioner Kevin McAleenan said in an interview Tuesday morning.
The UN High Commissioner for Human Rights Michelle Bachelet yesterday called for an worldwide investigation. Saudi Arabia has already detained 21 people and says it is seeking the death penalty for five.
The Fortnite Team state that, "Like Battle Royale and Save the World, we're committed to making this bigger and better over time". This means that Fortnite servers will be down by 9am and will not allow for any new games to start.
Musk also said several times during the interview that he doesn't respect the SEC, though he is abiding the settlement terms. The Tesla Factory in Fremont, California is a former GM plant that closed in 2010 but reopened later that year under Musk.
A woman who makes Donald Trump's bed and irons his clothes undocumented immigrant, it has been revealed. "The workers panicked. Mr Trump made a crackdown on illegal immigration one of the central planks of his campaign and presidency.
The first official downloadable character for Super Smash Brothers Ultimate is Joker, from Atlus's Japanese RPG Persona 5 . Fortnite maker Epic Games also launched its new PC and Mac games store, created to compete with Valve's Steam store.
According to Station Index, Seattle is the U.S.' 14th largest TV market, and it's the largest city without a winter sport. Seattle's ownership group will pay a $650 million expansion fee to join the league.
It was reported in November that Nauert had been offered the job, but it was not clear at the time whether she had accepted. Nauert would take up the USA mantle at the United Nations including holding sanctions on North Korea and defending Israel.
Instead of the attention going to a world-class player for her talent it will all be about Solveig's question". Hegerberg told BBC Sport she "didn't consider it sexual harassment or anything in the moment".
Key Democrat says Trump allegations could be 'impeachable'
He's pardoned Joe Arpaio, the former Arizona sheriff who was convicted of criminal contempt for disobeying a judge's order, and I. Under US law, campaign contributions, defined as things of value given to a campaign to influence an election, must be disclosed.
Storm brings heavy snow to southern West Virginia
Meanwhile, police in Virginia say there have been significant delays on interstates as vehicles stuck in snow have impeded travel. Officials in several states urged residents to stay off the roads and instead enjoy holiday festivities with their loved ones.
Female Directors Left Out of 2019 Golden Globe Nominations
It's a huge day for the Marvel Cinematic Universe , which is finally getting some overdue recognition during Awards Season. Even though she's been there and done that with the Globes, she's still positioned to make history if she wins again.