MPs have debated for a second day on the EU (Withdrawal) Bill, with key votes expected on plans by peers for membership of the single market and the customs union.
A potentially explosive rebellion over customs arrangements appears to have been headed off for the moment by government whips, but pro-EU Conservatives are thought to be keeping their powder dry until the trade bill comes to the Commons next month.
Attention now turns to Labour as scores of MPs are expected to rebel against Jeremy Corbyn over a Lords amendment that would effectively keep the UK in the single market.
It comes after prime minister's questions descended into chaos when the SNP’s leader in Westminster was expelled from the chamber and his party performed a mass walkout.
Ian Blackford was kicked out when he attempted to force a vote to make the Commons sit in private in protest over the lack of time to debate key devolution issues during the bill's session on Tuesday.
During the session, Jeremy Corbyn tackled Theresa May on Brexit as he attempted to highlight divisions within the Conservative party.
Mr Corbyn also mocked the prime minister asking whether she has invited Donald Trump, the US president, to take control of the negotiations in Brussels – a reference to Boris Johnson’s recorded remarks last week.
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She said: "My approach to this question is simple, the economy has to come first and the economics are clear. I feel that I have a duty to prioritise jobs, livelihoods and public services for my constituents.
"I acknowledge the EEA isn't perfect but for the minute the combination of the EEA and the customs union is the only way to avoid a hard border on the island of Ireland."
Caroline Flint, the former Labour minister, has said she vote in favour of the Labour amendment seeking to "delete the EEA option", and that if that was lost she would vote against the EEA amendment.
She told fellow MPs: "We cannot just cobble together an idea that the EEA amendment puts together - there has to be an end to freedom of movement just in the way my honourable friends on the front bench have suggested and then we out of that decide what migration we want in the future."
She said her Leave-supporting constituents who had been insulted "day in and day out by some of the comments in this place and outside are not against all migration", but said they "do want to have a sense that we can turn the tap on and off when we choose".
"But also they want us to answer the question why hasn't Britain got the workforce it needs, why has social mobility stopped, why do we train fewer doctors than Holland or Ireland and why are these jobs dominated by those in the middle and upper classes so my constituents don't get a look in?"

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Environment secretary has previously pledged to tackle plastic pollution and distributed reusable cups to cabinetShe told the Commons: "I will be voting for the EEA amendment because I believe, as I have said many, many times in this place, of the value of the single market."
Ms Soubry urged MPs to advocate the case for immigration and "suck it up", saying: "Suck it up: there is no alternative that has been advanced in this place other than the customs union, the single market.
"Let's grab it, let's do it and move on."
Outgoing Daily Mail editor Paul Dacre has warned that it would be "editorial and commercial suicide" for the newspaper to give up its support for Brexit.
There has been speculation that the arrival in November of Mr Dacre's successor Geordie Greig might signal a softening in the Mail's steadfast support for EU withdrawal.
Under Mr Greig's editorship, the Mail on Sunday came out in support of Remain in the 2016 referendum, in stark contrast to its weekday sister paper.
But Mr Dacre - who is to become chairman and editor-in-chief of Mail-owning Associated Newspapers - left no doubt of his belief that any shift would risk alienating the paper's readership.
Writing in The Spectator, Mr Dacre said that he had been moved since the announcement of his impending departure from the editor's chair by "countless messages from readers worried about whether the Mail will continue its support for EU withdrawal".
He added: "My answer to them - and others - is unequivocal. Support for Brexit is in the DNA of both the Daily Mail and, more pertinently, its readers.
"Any move to reverse this would be editorial and commercial suicide."
Mr Dacre also made clear he had no regrets about his decision to promote the debate on immigration in the pages of the Mail.
"One of the main reasons Britain voted Brexit was the refusal by our ruling class, led by the BBC, to allow a mature debate on mass immigration which has nothing to do with race and everything to do with numbers," he wrote.
"If the Mail promoted that debate and helped prevent the rise here of the kind of ugly right-wing political movements now festering across the EU, then I suffer my critics' obloquy with pride."
The European Commission has unveiled plans to roughly triple its spending on border controls in response to the refugee crisis.
Spending in the 2021-27 budget period, which is currently the subject of intense negotiations between member states and the EU institutions, would increase to €34.9 billion, up from €13 billion in the current period.
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