Theresa May has told MPs that parliament will be given a vote on whether or not to opt for a no-deal Brexit if her proposed withdrawal plan is rejected next month.
The prime minister said that, if MPs again vote down her proposed deal, the Commons will be given a say on whether to approve or reject a no-deal outcome. If they choose to reject it, another vote would be held on whether to extend the Article 50 period.
Ms May was responding to numerous Remain-backing ministers threatening to quit if she failed to give parliament the right to block a no-deal Brexit.
She insisted she did not want to see Article 50 extended and refused to be drawn on how long any extension might be, saying only that she would want it to be "as short as possible". She also declined to say how Tory MPs would be ordered to vote on the matter of whether to accept a no-deal Brexit or delay leaving the EU.
Please allow a moment for the liveblog to load...
"We specifically agreed yesterday, as the Labour Party, that if the Prime Minister's deal gets through, that deal should be subject to the lock, if you like, of a public vote in the way that Jeremy (Corbyn) spelled out yesterday," he told BBC Radio 4's Today programme.
Sir Keir, who said he would vote to remain in the EU, rejected claims from anonymous sources who had briefed that shadow foreign secretary Emily Thornberry "misspoke" when she set out the position on the referendum.
Asked if advisers to Mr Corbyn did not agree with the position, Sir Keir said: "I don't know who said what. What I do know is you have got elected politicians on your programme, you had Emily Thornberry out last night, setting out what the position is we agreed as the Labour Party."
Asked about a potential Labour revolt over a referendum, Sir Keir acknowledged: "I'm well aware of different views across my own party and across Parliament on pretty well all Brexit issues."
Keir Starmer has slapped down Jeremy Corbyn's aides over the issue of what would be on the ballot in any second referendum

Keir Starmer slaps down Corbyn aides over second Brexit referendum ballot question
Shadow Brexit secretary insists 'elected politicians' decide policy, saying: 'If Theresa May’s deal goes through, it is subject to the lock of a public vote'
Opinion: Labour has put a Final Say back on the table – here’s how a second referendum could work
It is too early to declare victory. But Corbyn appears, after all, to have honoured his sovereign Labour conference decision to hold a popular vote once a general election was no longer a realistic option
Nigel Farage threatens to boycott second Brexit referendum, saying he would 'rather go on holiday'
Ex-Ukip leader says it would be an 'outrage' if Remain was on ballot paper for fresh vote
The rich are getting richer while poor are getting poorer, official figures show
Incomes of richest fifth of households grow by 4.7 per cent – while poorest fifth of households suffer a 1.6 per cent fall
Theresa May forced to give MPs vote on delaying Brexit in major climbdown
MPs will be given a vote on delaying Brexit if they reject Theresa May’s deal next month, in a humiliating government climbdown. The prime minister vowed to pressure to allow the Commons to decide on extending Article 50 – to head off mass ministerial resignations. The pledge was given in a statement to MPs, despite numerous occasions on which Ms May vowed that the UK would"This is not dithering, it's a deliberate strategy to run down the clock."
He adds:
"The responsibility for this lies exclusively with the prime minister and her government’s shambolic handling of Brexit. Even now, with just one month to go before our legally enshrined exit date, the prime minister is not clear what she wants in renegotiations that have now dragged on since it became clear in December that her deal was not even backed by much of her own party, let alone Parliament or the country."
Announcing the guarantees in the Commons, Ms May said: "They are commitments I am making as prime minister and I will stick by them, as I have previous commitments to make statements and table amendable motions by specific dates."
She added: "Let me be clear, I do not want to see Article 50 extended. Our absolute focus should be on working to get a deal and leaving on March 29."
The confirmation that MPs would be given a vote on no-deal was enough for some potential rebels, with one of the main architects of a plan to force the government to guarantee a Commons vote saying he was "satisfied" there was no longer any need for the amendment.
Former minister Oliver Letwin said Ms May's offer "does what is needed to prevent a no deal exit on 29 March and enables MPs to forge a cross-party consensus on a new way forward if the PM's deal does not succeed on 12 March". There was now "no need" for the motion he was due to table with Labour's Yvette Cooper, he added.
