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The Liberal Democrats and the SNP have joined forces to try and trigger a general election in December, according to reports.
Party leaders Jo Swinson and Ian Blackford are set to push for the early date if the EU agrees to a three-month extension to Brexit .
In a letter to European Council president Donald Tusk on Saturday, they said a delay until 31 January – with no option of leaving early - would prevent the UK leaving without a deal.
“With an extension to at least January 31 – or later – we, the opposition, can work together to facilitate an election giving the people the chance to decide what the UK’s next steps should be.”
It potentially marks a shift away from the position of Jeremy Corbyn, who said Labour would only support an election once no-deal Brexit has been taken off the table.
All three parties say on Monday they will oppose Boris Johnson’s motion for a general election.
Instead the Lib Dems plan to introduce a bill to amend the Fixed Term Parliaments Act so a general election can take place on 9 December, according to reports.
Best pictures from Final Say Brexit marchShow all 76 1 /76Best pictures from Final Say Brexit march Best pictures from Final Say Brexit march Crowds march through central London
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Best pictures from Final Say Brexit march Protesters gather in Parliament Square
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Best pictures from Final Say Brexit march Mayor of London Sadiq Khan joins protesters
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march Anti-Brexit protesters fill Parliament Square in London
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march A demonstrator marches
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march
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Best pictures from Final Say Brexit march Protesters push a float depicting Dominic Cummings using Boris Johnson as a puppet during the Final Say Brexit march in London
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Best pictures from Final Say Brexit march EU supporters react after the result of the vote on the deal delay was announced at the House of Commons
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Best pictures from Final Say Brexit march A demonstrator carries his dog draped in EU flag
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Best pictures from Final Say Brexit march Thousands of people taking part in a People's Vote march
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Best pictures from Final Say Brexit march Protesters use their flags to shelter from the rain
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Best pictures from Final Say Brexit march Protesters march towards Parliament Square
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Best pictures from Final Say Brexit march Anti-Brexit demonstrators carry placards and EU flags
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Best pictures from Final Say Brexit march Sir Oliver Letwin MP in Parliament Square, London, during an an anti-Brexit, Let Us Be Heard rally, after it was announced that the Letwin amendment, which seeks to avoid a no-deal Brexit on October 31, has been accepted
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Best pictures from Final Say Brexit march Thousands of people taking part in a People's Vote march
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Best pictures from Final Say Brexit march A protester with "Bollocks to Brexit" stickers on his head
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Best pictures from Final Say Brexit march Demonstrators march
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Best pictures from Final Say Brexit march Britain's main opposition Labour Party shadow Secretary of State for Exiting the EU Keir Starmer, shadow Home Secretary Dianne Abbott, shadow Chancellor of the Exchequer John McDonnell, shadow Foreign Secretary Emily Thornberry speaks on stage in Parliament Square
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Best pictures from Final Say Brexit march Anti-Brexit supporters cheer outside parliament
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Best pictures from Final Say Brexit march Protesters shout and chant demanding a final say
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Best pictures from Final Say Brexit march Pro-Brexit protesters outside the Houses of Parliament in London
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Best pictures from Final Say Brexit march People taking part in an Anti-Brexit, Let Us Be Heard march head to Parliament Square in London
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Best pictures from Final Say Brexit march People taking part in an Anti-Brexit, Let Us Be Heard march in Trafalgar Square
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Best pictures from Final Say Brexit march Anti-Brexit supporters cheer outside parliament
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Best pictures from Final Say Brexit march People taking part in an Anti-Brexit, Let Us Be Heard march past Trafalgar Square
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Best pictures from Final Say Brexit march Protesters shout and chant
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Best pictures from Final Say Brexit march Cory (7) sits on his father's shoulders as protesters march towards Parliament Square
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Best pictures from Final Say Brexit march People attend the 'Together for the Final Say' march
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Best pictures from Final Say Brexit march Protesters march towards Parliament Square
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Best pictures from Final Say Brexit march Mayor of London Sadiq Khan speaks on stage
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Best pictures from Final Say Brexit march Anti-Brexit protesters fill Parliament Square in London
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Best pictures from Final Say Brexit march Anti-Brexit protesters hold an Independent banner
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Best pictures from Final Say Brexit march Protesters hold an anti-Brexit placard by The Independent stall during the Final Say Brexit march in London
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Best pictures from Final Say Brexit march Anti-Brexit protesters in Parliament Square, London,
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Best pictures from Final Say Brexit march Demonstrators hold placards and EU flags
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Best pictures from Final Say Brexit march An anti-Brexit protester joins in the Final Say Brexit march on 19 October
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Best pictures from Final Say Brexit march EU supporters march in London
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Best pictures from Final Say Brexit march Sir Patrick Stewart and Paul McGann join in the Final Say Brexit march in London on 19 October
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Best pictures from Final Say Brexit march EU supporters march
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Best pictures from Final Say Brexit march A demonstrator shouts into a megaphone as she marches
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Best pictures from Final Say Brexit march A dog dressed in an anti-Brexit placard is walked in the Final Say Brexit march in London
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Best pictures from Final Say Brexit march EU supporters march
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Best pictures from Final Say Brexit march A morris dancer takes part in the Final Say Brexit march in London
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Best pictures from Final Say Brexit march Whippets are dressed in EU flag clothing during the Final Say Brexit march in London
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Best pictures from Final Say Brexit march Protesters march towards parliament in the Final Say Brexit march in London on 19 October 2019
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Best pictures from Final Say Brexit march An anti-Brexit demonstrator takes part in the Final Say Brexit march in London
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Best pictures from Final Say Brexit march EU supporters call on the government to give Britons a vote on the final Brexit deal
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Best pictures from Final Say Brexit march Anti-Brexit protesters
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Best pictures from Final Say Brexit march An anti-Brexit protester
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Best pictures from Final Say Brexit march Anti-Brexit protesters demonstrate in London during the Final Say Brexit march on 19 October
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Best pictures from Final Say Brexit march Protesters push a float depicting Dominic Cummings using Boris Johnson as a puppet during the Final Say Brexit march in London
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Best pictures from Final Say Brexit march Protesters march towards parliament from Park Lane in the Final Say Brexit march in London on 19 October 2019
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Best pictures from Final Say Brexit march Marchers visit The Independent stall during the Final Say March in London
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Best pictures from Final Say Brexit march An anti-Brexit protester holds a sign calling for a Final Say during a march in London
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If that fails, the SNP will table a vote of no confidence in the prime minister and attempt to dissolve parliament this week so an election can be held on 5 December.
Ms Swinson said: “Boris Johnson has missed his ‘do-or-die’ deadline (of 31 October) and is now asking parliament to give him a general election and time for him to ram through his Brexit Bill through parliament.
“We need to get Boris Johnson out of office, unlock the gridlock in parliament and give people the chance to vote to stay in the EU.”
The SNP leader said he wanted an election this year “on parliament’s terms not on the prime minister’s”.
Mr Blackford added: “Boris Johnson’s proposal of an election – but only after he tries to pass his deeply damaging Brexit Bill through parliament and take the UK out of the EU – is simply not acceptable to us.
“Opposition parties will not be bullied by a prime minister who has shown utter contempt for parliament, and who has attempted to railroad through his damaging deal without a shred of scrutiny or due process.
“On top of that, he is now asking parliament to back an election without knowing the terms of an extension to the Article 50 process.
“For these reasons we will not support Boris Johnson’s election motion on Monday.”
However SNP MP Angus MacNeil immediately rejected the suggestion of an election in December. He tweeted: “I am not getting bounced in to this ... it was “madness” to have a winter election. Any election now will be a proxy Brexit referendum and Hard Brexit could be won in 6 weeks.”
Additional reporting by Press Association
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