He writes to MPs warning the EU may reject "Parliament's request" for a Brexit delay - after they backed an amendment compelling him to ask for an extension.
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BBC News Parliaments
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Reaction as MPs tell PM to ask for Brexit delay
Latest updates as MPs vote to delay Brexit until necessary UK legislation is passed.
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Live
Reaction as MPs tell PM to ask for Brexit delay
Latest updates as MPs vote to delay Brexit until necessary UK legislation is passed.
As it happened: AMs debate second homes ownership
AMs call on the Welsh Government to ensure that council tax is paid on second homes.
FM urged to intervene over mesh surgeon trip cancellation
Nicola Sturgeon is urged to intervene after a world leading surgeon cancelled his visit to Scotland to help remove mesh implants.
Commons appoints new Serjeant at Arms
Nigerian-born Ugbana Oyet will take up the position, which involves keeping order during debates.
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Live
Reaction as MPs tell PM to ask for Brexit delay
Latest updates as MPs vote to delay Brexit until necessary UK legislation is passed.
As it happened: AMs debate second homes ownership
AMs call on the Welsh Government to ensure that council tax is paid on second homes.
FM urged to intervene over mesh surgeon trip cancellation
Nicola Sturgeon is urged to intervene after a world leading surgeon cancelled his visit to Scotland to help remove mesh implants.
Commons appoints new Serjeant at Arms
Nigerian-born Ugbana Oyet will take up the position, which involves keeping order during debates.
As it happened: AMs debate second homes ownership
AMs call on the Welsh Government to ensure that council tax is paid on second homes.
FM urged to intervene over mesh surgeon trip cancellation
Nicola Sturgeon is urged to intervene after a world leading surgeon cancelled his visit to Scotland to help remove mesh implants.
Commons appoints new Serjeant at Arms
Nigerian-born Ugbana Oyet will take up the position, which involves keeping order during debates.
Latest Updates
The government has lost a vote on its Brexit deal, compelling it to seek a delay from Brussels.
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Mark D'Arcy
Parliamentary correspondent
After suffering a narrow defeat, by Brexit standards, the government and its opponents plot their next moves.
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The party helped pass the amendment that could delay Brexit until all necessary laws are passed in Parliament.
Read moreLiberal Democrat leader Jo Swinson requested a break to let the PM ask for an extension.
A simple guide on the UK leaving the European Union.
Read moreHe tells the Commons his amendment means it's impossible for the UK "to crash out without a deal".
Find out if your MP voted for a proposal to withhold Commons approval to the Brexit deal until it becomes law.
Read moreDUP deputy leader Nigel Dodds says the party's focus is the integrity of the union.
Peter Barnes
Senior elections and political analyst, BBC News
The British government and the EU have agreed a new Brexit deal, but will it get through Parliament?
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