Jeremy Corbyn‘s plan to prevent a no-deal Brexit by becoming a caretaker prime minister has been met with opposition from key potential allies.
The Labour leader plans to delay Brexit if he wins a no-confidence vote in the government. He would then call a snap election and campaign for another referendum.
Liberal Democrat leader Jo Swinson said she would not support making Mr Corbyn prime minister.
But, the SNP and Plaid Cymru did not rule out supporting a cross-party government to stop a no-deal Brexit.
Meanwhile Boris Johnson tweeted on Thursday evening: “The referendum must be respected. We will leave the EU on 31st October. #LeaveOct31.“
Ms Sturgeon indicated that her 35 MPs could support the plan.
Some Tory rebels have also apparently suggested they would meet with Mr Corbyn.
But, senior Tory Remainer Dame Caroline Spelman and the Independent Group for Change refused to support any Corbyn government.
So did Ms Swinson who called for a less divisive figure to form a unity government, such as veteran MPs Ken Clarke or Harriet Harman.
“There is no way he can unite rebel Conservatives and Independents to stop Boris Johnson,“ said Ms Swinson, who gained her 14th MP on Wednesday.
“It is not even certain that he would secure all the votes of Labour MPs.“
But Ms Sturgeon said the Lib Dems “should rethink“, adding: “Jeremy Corbyn’s suggestion is not the only possible option – but given the circumstances, nothing should be ruled out at this stage.“
The SNP leader told the BBC: “It’s no secret, I’m not the greatest fan of Jeremy Corbyn, but we won’t rule out any option if it helps avert what is a looming catastrophe of a no-deal Brexit.“
Mr Corbyn proposed forming a government on a “strictly time-limited“ basis to prevent a sudden departure under Boris Johnson, hoping he could win over his personal critics to support the anti-no-deal cause.
But the reaction was mixed, with the five-strong Independent Group for Change flatly rejecting it.
Leader Anna Soubry said Mr Corbyn “is not the person given he struggles to maintain the confidence of his own backbenchers“.
Dame Caroline also said she could not support the proposal, nor a vote of no confidence in her own Government.
“I could not support a Corbyn Government, end of,“ she told the Birmingham Mail.
Plaid Cymru’s Westminster leader Liz Saville Roberts offered her cautious support, saying the party is open to a unity government regardless of who leads it.
And Mr Corbyn appeared to have convinced some of his opponents within his party on the basis of blocking no-deal.
Backbench MP Wes Streeting said the Lib Dems were “wrong to reject“ Mr Corbyn’s offer, saying it should be “treated seriously“ by everyone trying to stop no-deal.
Green MP Caroline Lewis also called on Ms Swinson to rethink in a “personal appeal“, saying: “Please join us in engaging with Corbyn to see if we can find a way forward.“
Remain-backing Tory MP Guto Bebb was lukewarm about whether it was the right move, but told BBC Radio 5 Live he “will consider anything that avoids the pitfall of a no-deal Brexit“.
“It’s certainly an option which has been put on the table and should be at least considered,“ he said.
However, Transport Secretary Grant Shapps said: “I think it’s absolutely extraordinary that any Conservative MP considered even for one minute installing Jeremy Corbyn in Downing Street.
“Jeremy Corbyn would wreck our economy, he would destroy jobs and the livelihoods, savings, I think he also can’t be trusted with security or crime and … I just think that any Conservative should think very, very hard about doing this. It actually presents a very clear choice.
“You either have Jeremy Corbyn as prime minister overturning the result of the referendum or Boris Johnson respecting the referendum, putting more money into the NHS, more police on the streets to keep us all safe.“
Shadow business secretary Rebecca Long-Bailey appealed to critics by saying the move is “not about implementing Labour policy“ but about avoiding the “unfathomable“ damage a no-deal could cause.
“What I would say is issue a plea to Jo Swinson particularly. I know that Jo wants to avoid a no-deal situation as we do, and we think this is the simplest and most democratic way of doing that,“ she told BBC Radio 4′s Today programme.
Mr Corbyn announced the plan in a letter on Wednesday to opposition leaders and Tory MPs Dominic Grieve, Sir Oliver Letwin and Dame Caroline.
Mr Grieve and Sir Oliver have not yet commented directly on the proposal. Neither has Nick Boles, the independent MP who quit the Conservatives over Brexit and who also received the appeal.
But a letter being circulated and apparently signed by the trio said they were willing to meet Mr Corbyn and other opposition parties to discuss no-deal prevention options.
It also featured Dame Caroline’s name, despite her clear opposition to a Corbyn government.
The Labour leader said he would seek a no-confidence motion soon after the House returns from its summer recess on September 3. This would need the support of the majority of MPs.
He would then seek an extension to the Article 50 process to delay the UK leaving the European Union past the October 31 deadline.
Then, as PM, he could table a motion for an early general election which would succeed with the support of two-thirds of the seats in the Commons, in the same fashion as Theresa May’s vote in 2017.
Mr Corbyn said Labour would campaign in that election for a second referendum on EU membership with the option to Remain being available to voters