Parliament sits for first Saturday in 37 years to vote on a new Brexit deal
MPs vote by 322 to 306 in favour of the Letwin amendment
It requires a delay to Brexit until necessary UK legislation is passed
PM insists he will not negotiate a delay with the EU
The result means Parliament will not vote on PM's deal until next week
Anti-Brexit protesters rally outside Palace of Westminster
The group People's Vote wants a 'final say' vote on Brexit
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Independent MP Dominic Grieve says the deal "threatens the future of the United Kingdom directly". He adds he will support Sir Oliver Letwin's amendment and other MPs should do the same.
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Labour MP Liz Kendall says the PM's deal could put the future of the Union "at risk" and that it contains no legal guarantees for workers' rights. She adds it is not what people were promised at the referendum.
Katya Adler
Europe Editor
All eyes across the European Union are looking at Parliament today to see what happens.
Three years of Brexit process and the EU is fatigued. They want to encourage MPs to focus their minds on the Brexit deal in front of them.
The EU says it is the end of the negotiating line for them, and they have been very coy about the idea of granting another extension - in order to keep that pressure on Parliament.
But it is very difficult to see the same EU that has made two Brexit deals with two British prime ministers suddenly turning round and saying they've had enough.
EU leaders have always tried to avoid a no-deal Brexit.
If they refuse an extension and there is no deal that is what they are walking themselves and their economies into, and they are unlikely to do that.
For now they are watching the vote and worrying about the future.
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The DUP's Sammy Wilson says today should be a "day of rejoicing", but the PM's deal would leave Northern Ireland "within the clutches of the European Union". It would create a "hard border" between Northern Ireland and the rest of the UK.
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Former Chancellor Ken Clarke, who sits as an independent MP having lost the Conservative whip, says Boris Johnson's deal is "very bad" and "wholly inferior" to Theresa May's. He adds that he has "considerable sympathy" for the Northern Ireland unionists who oppose it.
But Mr Clarke says he will support the government.
Independent Group MP tweets view from Commons office...
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Labour MP Peter Kyle says the "prospectus for Brexit" was "very poorly defined" under Theresa May, and that neither the current government's deal with the EU nor Mrs May's "represents the will of the people".
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Theresa May says there should not be a second referendum "simply because people don't like the result of the first". Voting for a deal is the only way to avoid a no-deal Brexit, she tells MPs.
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Former Prime Minister Theresa May - whose own withdrawal agreement with the EU was rejected by the Commons three times - speaks. She says she has a "distinct sense of deja vu", adding that today's vote is "important". Mrs May says MPs should "put the national interest first" by supporting Boris Johnson's deal.
Katie Wright
BBC News reporter
Thousands of people are taking part in a slow march through central London to Parliament Square in support of the People’s Vote campaign.
Many are carrying the blue and yellow flag of the EU as well as placards, with phrases such as “let us decide” and “remain = no more pain”.
Among those is Simon Gosden, 63, from Essex, who says he never misses England rugby matches, but felt he had to today.
He attended the previous People’s Vote protests but says today’s is by far the most significant.
“There’s more of an air of tension today. We know we’re getting down to the nitty-gritty - it’s all or nothing.”
He’ll be following the goings-on in Parliament whilst on the march and says he’s feeling “quietly confident”.
Protesters calling for "final say" vote on new Brexit deal march in capital.
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Parliament
SNP Westminster leader Ian Blackford says no Labour MP should back the PM's deal, while there is a "no-deal threat on the table".
Labour MP Caroline Flint, who's supporting the deal, says that, "when it comes to workers' rights, the EU isn't God".
Mr Blackford says he would trust the EU with workers' rights "before I would trust the government".
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Cabinet minister Michael Gove is told by Speaker John Bercow to sit down, after he stands to intervene as SNP Westminster leader Ian Blackford criticises the government but refuses to make way for Mr Gove.
Image source, Reuters
Image source, PA MediaMayor of London Sadiq Khan (centre) joins protesters
Image source, PA MediaSir Patrick Stewart (centre) and Stephen McGann (left) were among those spotted on Saturday
Image source, Reuters
Image source, PAMeanwhile, pro-Brexit protesters also gathered outside Parliament
Image source, PA MediaThe amendment - named after the MP who put it forward, Sir Oliver Letwin - would withhold support for the deal and delay Brexit until all the necessary legislation is in place.
It is based on the concern that even if Parliament approved a deal today, there is a danger the legislation could somehow run into problems later down the line, and cause a no-deal Brexit.
This amendment, by provisionally approving the Brexit deal but also forcing Boris Johnson to ask the EU for a delay, aims to avoid any chance of a no-deal.
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SNP Westminster leader Ian Blackford says Scotland has been "totally and utterly shafted" by the government, having voted Remain in the 2016 referendum. He calls Boris Johnson a "Brexit fanatic" and describes the PM's deal as "blank cheque to the Leave campaign".
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Independent MP Sir Oliver Letwin speaks in favour of his amendment, saying it is aimed at keeping "in place the insurance policy" against the UK leaving the EU without a deal on 31 October.
He says the UK must be "secure" in requesting a delay to Brexit if necessary.
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Shadow Brexit secretary Sir Keir Starmer says Sir Oliver Letwin's amendment is "genuinely cross-party" and would not delay Brexit,
He goes on to say the PM's deal with the EU is "against everything Labour stands for". He urges MPs to reject it, ending his comments.
Katya Adler
Europe Editor
Concerns have been raised in today's debate about the possibility of a no-deal Brexit at the end of the transition period, says BBC Europe editor Katya Adler - but what does this mean?
Well, she explains in a series of linked tweets, "this Brexit deal only covers the exit, ie the UK leaving the EU".
"If a deal is approved by Parliament (and the European Parliament) then the EU and UK enter a ‘transition period’ where practical relations stay the same (including freedom of movement, UK membership of the single market and customs union).
"At the end of a two-year transition (or max of four years by EU law) there is no safety net.
"If a new trade deal and deal on other EU-UK relations such as security co-operation has not been negotiated and signed off by then... EU-GB relations default to WTO rules (ie, absence of preferential free trade agreement).
"Northern Ireland would remain aligned to EU regulations on goods and EU customs code unless Stormont voted against."
She adds: "Reminder: Leaving was supposed to be the easy part. Negotiating the future is likely to be a lot more complex - politically and practically - e.g. UK will be asked to allow access to its waters for EU fishermen in exchange for something else the UK wants etc.
"We’ve concentrated so much on goods in the Brexit negotiations, but 80% of the output of the UK economy is service based. FTAs don’t tend to cover services."
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Labour's Sir Keir Starmer says no trade union supports the PM's Brexit deal and questions the "likelihood" of Boris Johnson keeping his promises.