Don't miss all the drama of the Commons vote later today, with a BBC News special from 1900 GMT.

Sky News's senior Ireland correspondent quotes DUP sources, who suggest the party will not support Mrs May's Brexit deal.

Meanwhile, the Financial Times's Whitehall correspondent, Sebastian Payne, tweets:

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Conservative Caroline Spelman says the negotiators have brought back "important improvements".

She tells MPs that a lawyer she knows said the agreement carried "a minimal legal risk unlikely to be crystallized".

The attorney general agrees.

Brexit is now on the agenda for next week's European Council summit on 21 and 22 March, says the BBC's Brussels correspondent Adam Fleming.

Meanwhile in Strasbourg today, the European Commission spokesman says that the latest Brexit developments are on the agenda.

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BBC Radio 4

"The prime minister could announce by the end of this week we need a general election," Mr Walker continues, in regards to what would happen if the deal is rejected tonight.

He suggests that the PM would fly to Brussels in this scenario, in order to get an extension of Article 50 - the process by which the UK leaves the EU.

"Another referendum would not provide clarity," he says.

"It (a general election) might give a Parliament that can govern.

"It might give us a government with a majority.

"It might be a Labour government, I hope it isn’t, but it might well be."

He adds: "We are coming to the end of the road as a Parliament."

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Labour MP and Brexiteer Kate Hoey asks why the UK would sign up to anything that does not allow us to say, "This is not working and we are leaving."

Mr Cox replies that the UK could withdraw from the agreement.

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Charles Walker, vice chairman of the 1922 committee of Tory backbenchers, tells Radio 4's World at One programme that if the deal does not go through tonight, there "will be a general election within a matter of days or weeks".

"It is not sustainable, the current situation in Parliament," he says.

"We have backbenchers at each other’s throats.

"The country deserves more than this.

"We have to make a decision tonight and it has to be to let this deal pass."

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Labour MP Chris Bryant says the attorney general's argument hinges on the idea of what would be "highly unlikely".

"Everything I thought was high unlikely five of six years ago has happened," he says.

He recalls conversation he once had with Mr Cox - "I said he should be attorney general and he said: 'Oh that's highly unlikely.'"

Mr Cox replies that the conversation took place under a different prime minister.

The Brexit spokeswoman for Fianna Fáil - the main opposition party in the Republic of Ireland - says it is easier to exit the backstop now.

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Conservative leader of the ERG Jacob Rees-Mogg asks what penalties might happen if a future government decided to abandon the backstop.

Mr Cox says he "could not give countenance" to a future government deciding to disobey international obligations. It would be "unwise" for a country to resile their obligations, he states.

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Image source, HoC

The Independent Group MP Anna Soubry says the joint instrument does not change the withdrawal agreement.

She asks the attorney general to confirm that "this is the end of the road - there are no more negotiations with the EU".

"Yes," replies Mr Cox "negotiations are at the end - this is the moment of decision."

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Former Brexit minister and ERG member Steve Baker says that if the UK tries to negotiate under the terms of Mrs May's agreement it will either find itself "trapped indefinitely" or the UK will have to agree to being in a customs union with the EU.

Mr Cox says he "really" doesn't believe that this would happen. "I don't accept that the backstop is the base for any future arrangement," he adds.

The Leave-backing European Research Group (ERG) has recommended MPs do not back Theresa May's Brexit deal after its so-called Star Chamber decided that the new Brexit agreement did not meet the tests set for it.

Conservative MP Sir Bill Cash, a member of the ERG, said: "In the light of our own legal analysis and others' we do not recommend accepting the government's motion today."

MPs are gearing up for a big vote on Theresa May's Brexit deal on Tuesday - here are the basics.

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The DUP's Westminster Leader Nigel Dodds asks if the attorney general agrees with his own previous advice on the legal risk from the backstop. He says the "backstop is the bottom line" for the Irish government. "Northern Ireland and the rest of the United Kingdom could be trapped" if no superseding agreement is reached.

Mr Cox says his opinion has changed because of the ability to use "bad faith" protocols, and to add timings to arrangements and further negotiations.

The DUP, which were fiercely critical of Mrs May's previous Brexit deal, have not yet decided whether they will be backing the new deal.

Conservative MP Michael Fabricant says his decision rests on what the DUP decides.

Meanwhile, Thurrock's Conservative MP Jackie Doyle-Price urges her colleagues to back the deal.

And Simon Hart, a Conservative MP who voted for Mrs May's deal last time, says alternative options to the deal are "far more dire".

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Vince Cable praises Mr Cox's integrity but asks how respect for international law is "enhanced by a unilateral declaration to break it".

"No, no, no," replies Mr Cox.

He says the unilateral declaration "reinforces and further stresses the right of the UK to take measures to withdraw from the arrangements if there is a breach of bad faith".