Lawmakers are voting on Labour MP Yvette Cooper's bill to take a no deal Brexit off the table, and to force Theresa May to seek an extension to the process if she cannot pass her Withdrawal Agreement in the coming days.
Results of the main vote, as well as on a series of amendments, will be announced soon.
Nick Boles, the former Conservative MP who dramatically quit his party on Monday after his plan for a softer Brexit was voted down in the Commons, is clearly feeling liberated after giving up the party whip.
Boles has claimed on Twitter that Robbie Gibb, Theresa May's director of communications, is set on undoing the prime minister's efforts to find a Brexit compromise plan with Labour leader Jeremy Corbyn.
"I am no longer a member of the Conservative Party. So I can be blunt where previously I might have been discreet. The PM’s head of communications Robbie Gibb is a hard Brexiter who wants to destroy the PM’s new search for a cross party compromise.
"The Prime Minister would do well to tell Mr Gibb to get back in his box - or go back to the BBC," Boles added, referring to Gibb's former employer.
Analysis from CNN's Luke McGee
Tonight's vote is important because if the so-called 'Cooper Bill' passes, it effectively takes a no-deal Brexit off of the table.
The bill being debated in the House of Commons right now would, if passed, force Theresa May to request an extension to article 50 of her choosing, but beyond the current date of April 12. While the Prime Minister has already announced that she intends to do this, the Cooper Bill would allow MPs to change that date.
Further to that, the bill -- proposed by Labour MP Yvette Cooper -- also says that if the EU agrees to an extension but suggests a different date to that selected by either the Prime Minister or MPs, then May must immediately bring a fresh motion back to the Commons to reflect that.
It's all a little fiddly, but with so little time left, it paves the way to an extension that would require the UK to remain in the EU for a long time. And, as we wrote earlier, that opens a whole new can of worms.
With everything else that is currently going on with Brexit – from May and Corbyn trying to reach compromise to the President of the EU Commission, Jean Claude Juncker, saying that without a fresh way forward, the UK would not be granted a short extension – it's becoming clearer by the day that May is clinging onto Brexit by her fingernails.
A senior member of Jeremy Corbyn's shadow cabinet has urged lawmakers in the party to insist that any Brexit deal is put to the public in a confirmatory second referendum.
Emily Thornberry, the shadow Foreign Secretary, wrote to members of the shadow cabinet ahead of an emergency meeting on Wednesday evening, insisting they put the issue to a vote.
"If we look like reaching any other decision than confirmatory vote that would be in breach of the decision made unanimously by Conference in Liverpool and overwhelmingly supported by our members," wrote Thornberry, who was unable to attend the session, in a letter obtained by CNN. "It needs to be put to a vote by the Shadow Cabinet."
"The Tory Cabinet had that kind of vote yesterday after their eight-hour discussion yesterday so I think it is the least we should be doing after the one-hour discussion this evening," she said.
"And assuming all colleagues will agree with that principle, and given my absence, can I - in writing - confirm that my votes are that yes, any deal agreed by Parliament must be subject to a confirmatory public vote, and yes, the other option on the ballot must be Remain."
Thornberry suggested that if the party voted to endorse a referendum, MPs who oppose the plan would still be given leeway to state their position publicly.
"The reason I think that is fundamental is that - if that is the outcome - those of us who oppose it can only take collective responsibility for the decision - and defend it in public and on the media - if we are having to go along with what was democratically agreed between us, whether we personally agreed or not, especially given the breach of our commitments to our members at conference."
Labour MP Yvette Cooper's bill to rule out no deal has moved forward to a third debate and vote, after lawmakers supported its progress by 315 votes to 310.
Its first reading scraped through by 311 votes to 310, but it has picked up four more backers to increase its majority.
Labour leader Jeremy Corbyn hinted that Theresa May intends to put a Brexit deal to the House of Commons in a vote next week.
Speaking after his meeting with May, Corbyn said of a Brexit delay: "If it goes beyond the 22nd of May then clearly it does involve European elections, which the government absolutely does not want to be involved in. They made that very, very clear ... and that is why she is very keen to get a vote through the House next week"
Corbyn also said he raised the possibility of a confirmatory referendum on a Brexit deal, but was unclear on how firmly he pursued the option.
"It was raised by me at the beginning of the meeting. I said, 'Look, it is the policy of our party that we would want to pursue to option of a public vote to prevent crashing out or prevent leaving on a bad deal.'"
"There was no agreement reached on that, we just put it there as one of the issues that the Labour Party conference voted on last year," he added.
Labour leader Jeremy Corbyn has hinted his talks with Theresa May didn't quite go as he had hoped, calling the meeting "useful but inconclusive."
"We had a discussion and there hasn't been as much change as I expected but we are continuing to have some discussions tomorrow morning to explore some of the technical issues," Corbyn said, according to the Press Association.
"The meeting was useful but inconclusive," he added.
Corbyn said he advocated Labour's Brexit position during the talks. "We want to achieve a customs union with the European Union, we want to have access to the market and, in particular, we discussed the dynamic regulatory alignment that is guaranteeing European regulations as a minimum on the on the environment as well as consumer and employment rights," he said.
Notably, that synopsis of the conversation doesn't include any mention of a confirmatory referendum on any Brexit deal, for which many in his party have been pressing.
Labour MP Yvette Cooper is addressing the House, after lawmakers voted by a majority of one to move forward on her bill that would take no-deal off the table.
"We have put forward this bill ... for fear of the damage that no-deal would do to all of our constituencies," Cooper says.
She acknowledges that some people in Britain want a no-deal Brexit, and they want it as fast as possible. But she adds on the prospect: "It will hit other people's lives, and it is not fair."
Responding to a question on why the period for debate and votes on the bill has been compressed to just a few days, Cooper says such a timeline is necessary given the looming Brexit deadline. "This is a tight timetable for this bill because this is a tight timetable for this House, facing the deadline of 12th of April," she says.
"I could never have imagined when we started these debates ... that nine days from Brexit Day, nobody knows what's going to happen," she adds.
Opposition Labour leader Jeremy Corbyn had a "constructive" meeting with British Prime Minister Theresa May on Brexit on Wednesday, a Labour Party spokesperson said, and further discussions between the two sides will take place over the coming days.
"We have had constructive exploratory discussions about how to break the Brexit deadlock," the spokesperson said.
"We have agreed a programme of work between our teams to explore the scope for agreement."
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