More from Labour's Hilary Benn, who chairs the Committee on Exiting the European Union.

He says: "Tomorrow we will be asked to vote on whether we are prepared to leave the EU with no deal. Well that would be a disaster for the British economy and I would expect the House to reject that too.

"And therefore we will, on Thursday get to the point of having to apply for an extension of time to the European Union."

Mr Benn said he would like to see a series of so-called "indicative votes" held, where MPs are asked whether they want various options, for example for a free-trade agreement or a Norway-style deal.

The committee he chairs also suggested holding a parliamentary vote on whether there should be a further referendum for the British people on the Brexit deal.

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SNP MP Joanna Cherry says if she voted for the deal she would be "strung up by the nearest lamppost" in Scotland.

Ms Cherry adds that she "makes no apology" for voting against a deal which will "make Scotland poorer and less safe".

"It will adversely affect my government's economy and prosperity," she says.

Ms Cherry says as now "people know the truth", in another referendum Remain would win.

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"Whatever the government tried to do, I'm afraid, it did not succeed," says Conservative MP Boris Johnson.

Of Geoffrey Cox and Theresa May, he says: “Like Adam and Eve in the Garden of Eden they have sewed an apron of fig leaves that does nothing to conceal the embarrassment and dignity of the UK.”

Mr Johnson says he "cannot accept" Mr Cox's assertion that there is "a minimal legal risk that we will be trapped in the backstop", adding that the deal "sets us on the path to a subordinate relationship with the EU".

"This deal has now reached the end of the road," he says, adding that there are broadly two options: to leave without a deal which is "the only safe route and the only path to self respect", or take a route that will lead to "humiliation".

"We must not rule out no-deal," he says, adding that delaying Brexit "would achieve nothing".

The Telegraph's deputy political editor, Steven Swinford, says he has heard rumours that Mrs May might request a short extension to Article 50 - which is the process by which member countries can leave the EU.

The BBC's political editor says she has spoken to ministers, who are not expecting this - but that "doesn't mean it won't happen".

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Adam Fleming, the BBC's Brussels correspondent, says people will be "glued to their screens" in Europe to see the result tonight.

But if the government's deal is rejected, "it will not come as a surprise", he said.

"Lots of people were saying to me yesterday on the EU side, 'We just do not think Theresa May has got the numbers to get this deal through.'"

The EU is also waiting for a settled position from the UK, he says - whether there's a defeat, if no deal is taken off the table and whether Article 50 will be extended.

Conservative Party Vice Chair Helen Grant is the latest Conservative MP to switch to supporting Theresa May's deal this evening.

She is followed by Sir Geoffrey Clifton-Brown, who said: "While this withdrawal agreement is far from perfect: the time has come to honour the result of the referendum in full and leave the European Union. The right way of doing this is to vote for the deal tonight. This is what I intend to do."

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• Tonight, MPs will gather in the House of Commons to vote on the PM's Brexit deal. Last time the deal was voted on, in January, it was rejected by a record number of MPs. For more details about the vote tonight - including why it's so important - read our piece here.
• Theresa May has said her deal is "improved". So what has actually changed in it? Read about what's different in the new deal.
• "This looks like another dreadful day for Number 10," says the BBC's political editor Laura Kuenssberg. You can read her latest blog post here.

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Conservative former minister Sam Gyimah says "there is a difference between where we all were during the referendum campaign and where we are now".

"I could have voted for this deal if there was a sense of where we are going at the heart of it," he adds.

He says the backstop gives him "extreme cause for concern" as it is trying to "solve an impossible problem - taking control of our borders while wanting the other side to have open borders".

Mr Gymiah says an extension of Article 50 "is important".

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Plaid Cymru Westminster leader Liz Saville Roberts says, "No-one, of course, voted to make themselves poorer."

Her party will "never support" a withdrawal agreement which takes the UK out of the single market and customs union, she says.

"Leaving without a deal is a worst-case scenario" and "we cannot countenance that as an option," she says.

An extension of 3-6 months will do "nothing to dissipate the fog of uncertainty," she says and asks for a longer extension to Article 50 to allow for the UK to implement changes and for a final referendum.

Sinn Féin deputy leader Michelle O'Neill says the DUP is "hell bent" on pursuing a reckless and blinkered Brexit strategy that is "driving us all towards a no-deal catastrophe".

The Sinn Féin vice president was commenting after the DUP confirmed it would not support the Brexit withdrawal agreement, despite the latest assurances from the EU.

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The pound is volatile ahead of Tuesday evening's vote on the PM's Brexit deal.

It sank earlier after Geoffrey Cox, the government's senior law officer, published its legal advice, although has since recovered most of its lost ground. Read more here.

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Conservative Brexiteer Owen Paterson says "the people have gone against the will of the establishment".

"Everyone in this House has to recognise that they have to deliver what the people voted for," he states.

He says the ERG "are actually loyal Conservatives" and leaving the single market and customs union is "not being delivered by this proposal this evening".

"This argument is not going away," he warns.

"Laws will be imposed on us" by the rest of the EU and the UK will have to pay £39bn to the EU under the agreement, he adds.

He adds that the withdrawal agreement is in breach of the Good Friday Agreement.

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Alastair Campbell, Labour's former director of communications and Remain campaigner, says he has thought for a while that there might be another Brexit referendum coming.

Mr Campbell, who wants a further vote on EU membership, said: "At some stage, the government and Parliament have to acknowledge that unless we're going to be talking about this for the rest of our lives, you're only going to get the clarity that she keeps promising and the closure that everybody wants if you actually have a real credible form of Brexit and put it back to the people and say, 'Is this what you want?'

"And if people say, 'No,' to that we should stay in the European Union."