It's been revealed ex-Tory ministers Ken Clarke and Anna Soubry rebelled against the government by voting against the motion to disagree with Lords amendment, created to give Parliament a vote to prevent a "no deal" Brexit.
The Prime Minister met pro-EU Tories in her private room in the Commons moments before the crucial vote to hear their demands for a truly meaningful vote on the final deal.
The pro-EU faction got a boost when junior justice minister Phillip Lee resigned Tuesday, saying he could no longer support the government's "irresponsible" plans for Brexit.
Earlier this year, Lee had called on the government to release its economic impact assessments of Brexit and suggested the government change tack in talks with the European Union, underlining the deep rifts in his party over the best way to manage Britain's exit. Lee, who voted for Britain to remain in the E.U.in the 2016 referendum, said in a statement he was "incredibly sad" to resign but did so in order to vote against the government's position on a key amendment to the bill. Philip Lee said a choice between "bad and worse" options was not giving MPs a meaningful vote.
307 Conservative MPs backed the government, which is a strong result for Theresa May, who just hours earlier had feared she would lose her majority due to disgruntled Tory MPs.
The vote came on the first of two days of high-stakes debate and votes in the House of Commons on the government's flagship Brexit bill.
Talks will now be held between ministers and Tory MPs uneasy with the government's handling of Brexit, in the hope of reaching an agreement before the legislation is passed back to the House of Lords.
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Prime Minister hit by dramatic resignation as MPs debate Brexit
They believe that if there is no Brexit deal by the end of November, the government must clear its next course of action with MPs. One says: "If we do not get what we were promised the Government will be defeated after we have amended the Bill in the Lords".
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Shortly before MPs began voting, Sandbach praised the government for making "important concessions".
That came after the embarrassing spectacle of government minister Robert Buckland effectively negotiating with Grieve, through a series of interventions in the rebel backbencher's speech, in what Anna Soubry called "a peculiar sort of horse-trading" - and then literally negotiating with him, in whispered exchanges, as the debate went on around them.
Britons voted 52 percent to 48 percent in favor of exiting the European Union in a June 2016 referendum.
"She said that anything which undermines the government at home would make the negotiations with the European Union more hard".
But her concession to parliament means that lawmakers now have more power if she fails to secure a Brexit deal, which may lead to a softer approach to Britain's divorce.
On Tuesday, parliament will also debate other amendments, including a challenge to the government's plan to put March 29, 2019, or "Brexit Day", into law and an attempt to toughen a commitment to ensure a frictionless border between Northern Ireland and the neighbouring Irish Republic, which will remain in the EU.
In fact, her party is far from united.
Brexit protesters outside Parliament House.