Boris Johnson was accused of “behaving like a spoilt brat” after he sent an unsigned letter to the EU asking for an extension to Brexit.
The prime minister, having promised that he would never make such a request, was forced to do so after MPs voted to withhold approval for his withdrawal agreement.
Labour shadow chancellor John McDonnell said Mr Johnson “has to abide by the law” and may be in contempt of parliament, adding: ”He’s behaving a bit like a spoilt brat.”
However Michael Gove, the government minister in charge of Brexit preparations, insisted that the UK would still leave the EU on 31 October.
“We are going to leave by October 31,” he told Sky News. ”We have the means and the ability to do so and yesterday... we had some people who voted for delay, voted explicitly to try to frustrate this process and to drag it out.”
The government is planning to hold a “meaningful vote” on Mr Johnson’s deal on Monday but opposition MPs are seeking amendments to protect against a no-deal Brexit and hold a second referendum.
Supporters of a Final Say referendum are being urged to sign a letter which calls on officials in the UK and the EU to do everything they can to give the people a vote on the final Brexit deal.
Follow events as they happened in our liveblog below:
Boris Johnson sends EU unsigned letter seeking Brexit delay
Prime minister's gambit is denounced as 'pathetic' by MP who vows to bring legal action within days
Boris Johnson’s letters to Brussels 'may be in contempt of parliament', Labour's John McDonnell says
Prime minister faces possible legal action over his two letters to the EU - one relaying request to extend Brexit process and the other advising against itLawyers and legal commentators have been debating whether or not Boris Johnson's two letters ploy is in breach of the Benn Act - which compelled the prime minister to request a delay to Brexit beyond 31 October.
Here David Allen Green suggests there is no need to go to court. Donald Tusk, president of the European Council, has confirmed receipt of the request and it is now up to the EU member states to decide whether to grant an extension or not.
Former home secretary Amber Rudd, who voted for the Oliver Letwin amendment forcing the prime minister to seek an extension, has said she will support Mr Johnson's deal in the Commons.
Ms Rudd admits it is "not as good as Theresa May's deal" and will damage the UK's economy, reducing the GDP by between four and six per cent.
She describes it as a "compromise" - because it's better than no-deal.
"We have to make sure that we don't leave with no deal," Ms Rudd tells Sky News. "I want to support it and I will and I think, not all of us, but most of us former Conservatives, who supported the Letwin amendment will do so as well.
"I think it's absolutely right to say we don't want to leave with no deal but we do want to leave with a deal and this deal from the Prime Minister is good enough for me."

Glimmer of hope for Boris Johnson's Brexit deal as ex-cabinet minister Amber Rudd says she will back it
The IndependentFormer home secretary says most expelled Tories will back PM's agreement and she believes it will passNow supporters of a public vote are being urged to sign a letter which will be delivered simultaneously to Downing Street and the Houses of Parliament, as well as the European parliament and the European Council, before 31 October.

More than 100,000 sign letter demanding Final Say on Brexit in less than 24 hours
'Today, we're marching together to say we trust the people, not Boris Johnson, to solve this Brexit crisis', Kier Starmer saysSpeaker John Bercow said he would rule on Monday whether it was in order for the government to hold the vote.

Boris Johnson claims he would ‘rather be dead in a ditch’ than negotiate Brexit extension
Prime Minister speaking after his own brother walked out of government in protest at his position on EU"If an extension by a few weeks is necessary, I wouldn't have a problem with it," he added.
