Brexit delay bill passes the House of Commons
It would force Boris Johnson to ask EU for delay to Brexit to prevent no deal
PM says there must now be a general election
But his bid to hold one on 15 October fails due to lack of opposition support
Earlier, chancellor set out spending plans for coming year
House of Commons
Parliament
Conservative Sir Oliver Letwin rises to begin his speech.
He says the government has not produced a "single indication" that it has "a viable proposal to replace the backstop" that would be acceptable to the EU.
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The debate will last for three hours.
Therefore any vote is likely to be held at around 22:00 BST.
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House of Commons
Parliament
Image source, HoCJohn Bercow says he is satisfied that the application is acceptable.
MPs stand to express their approval, so the debate will go ahead.
Conservative Sir Oliver Letwin makes the application.
He says: "In the light of the government's decision to prorogue Parliament, it has become an urgent matter for MPs to discuss whether it will accept a no-deal Brexit."
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In a few minutes an MP will apply for an emergency debate.
To apply for an emergency debate to be held, an MP must ask the Speaker in the House of Commons.
They have three minutes to persuade the Speaker that the emergency debate should be held.
After convincing the Speaker, the MP then needs to get consent from their fellow members of Parliament.
MPs can signal their support for the debate by standing up.
The Irish government has confirmed Mr Johnson will be heading to the Republic early next week for talks with the Taoiseach (the Irish PM).
A spokesman for Leo Varadkar said: "The prime minister has accepted the Taoiseach's invitation to visit Dublin and is due to arrive on Monday.
"Further details are being finalised."
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Laura Kuenssberg
BBC political editor
It seems right now - although there is still some arm twisting going on behind the scenes - that the government is set to lose the vote.
We are finding ourselves in the middle of a full-throttle confrontation between a Parliament that does not want to allow the country to leave the EU without a deal and a prime minister who secured his place in power promising he would always keep that as an option.
Both of them cannot be the victors here.
And they are both determined to win.
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BBC Yorkshire's political editor tweets...
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In theory, this means he will be able to take part in tonight's vote.
House of Commons
Parliament
Liberal Democrat Brexit spokesman Tom Brake asks for a guarantee that civil servants will not be disciplined if they refuse to "water down" no-deal documents at the request of ministers.
In response, Tory minister Michael Gove says the Yellowhammer preparation documents were prepared "independently" by civil servants.
It is important such documents reflect the "range of possibilities that leaving the European Union might entail".
Former Conservative minister Phillip Lee says a radio interview featuring Leader of the House of Commons Jacob Rees-Mogg was the "straw that broke the camel's back" in his decision to defect to the Lib Dems.
"The way in which Mr Rees-Mogg referred to the consultant, his manner, his disdain, his disregard for an expert's advice was really quite shocking," said Dr Lee.
"That in tandem with this language sort of invoking battles and wars and the like, I'm sorry, it's wrong."
"I think that it's about time we raise the bar in politics."
House of Commons
Parliament
Tory MP Michael Gove also criticises the legislation that opposition MPs and rebel Tories are hoping to pass to prevent a no-deal Brexit.
If enacted, he says, the bill would allow the EU to "dictate" the length of any further delay, and put conditions on an extension of the UK's membership.
He accuses Labour of wanting to "sabotage" talks with the EU and undermine the national interest.
Radio 4 PM
Image source, ReutersThe ex-justice minister says his decision to leave the government benches in the Commons and cross the floor to join the opposition benches with the Liberal Democrats was "not one that I arrived at overnight".
"After 27 years in the Conservative Party it’s been a very difficult decision," the pro-EU Bracknell MP says.
"I did not think the Conservative Party was my home any more and I looked at the Liberal Democrats and thought: 'That’s where I am.'"
He says it has been "quite remarkable the way in which this Number 10 operation is behaving".
There has been a "change of tone" and a "change of culture", he says.
"People are being bullied.
"Conservative members of Parliament who have strong beliefs in this particular area are told you are no longer a Conservative if you vote with your conscience this evening. It's just not acceptable."
House of Commons
Parliament
Labour's Jon Trickett says MPs must be allowed to see the "detailed assessments" contained in the Operation Yellowhammer documents, accusing Michael Gove of "hiding" them.
He asks for the documents to be made available for MPs to view, adding that no-deal preparations are currently receiving "no scrutiny or accountability" from the Commons.