John Bercow is facing demands from the Government to allow MPs to have a “meaningful vote” on Boris Johnson’s Brexit deal as the Prime Minister fights to fend off new threats to his plans.

All eyes are on the Commons Speaker as he decides whether to allow the vote to take place on Monday amid concerns that he may reject it because of parliamentary rules.

The Government was also working to fend off Labour attempts to secure a customs union and a fresh referendum.

Boris Johnson
Boris Johnson speaks in the House of Commons (House of Commons/PA)

In his latest Commons defeat, Mr Johnson abandoned plans for a meaningful vote on Saturday when MPs backed a move forcing him to ask Brussels for a further delay.

But because the deal had been debated, there are concerns that Mr Bercow could block a vote coming back so soon because of rules over the same matter being discussed twice.

Downing Street said it would pull Monday’s vote if any amendments are selected which would “render the vote pointless”.

“There is no point having a meaningless vote – the Government would pull the motion. We will go ahead with the introduction of the WAB with second reading tomorrow,” the PM’s official spokesman said.”

It came after Chief Secretary to the Treasury Rishi Sunak denied that trying to bring the deal back for a vote was a bid to portray Parliament as being obstructive.

“It was an observation on the deal happening and I think what people need is a substantive vote,” he told BBC Radio 4’s Today programme.

“I think people are crying out to see that and they would find it odd if, because of some technical procedural device, we weren’t able to have that vote.”

If the Speaker does block the move, focus will switch to the Government bringing its Withdrawal Agreement Bill (WAB) before MPs on Monday, with a vote on its second reading on Tuesday.

The WAB is the legally-binding treaty that must be passed for the UK to leave the bloc, while the Government must also win a meaningful vote.

Brexit Secretary Stephen Barclay called on MPs to “respect the referendum” by backing the Bill, warning them: “This is the chance to leave the EU with a deal on October 31.”

Ministers insist they could have sufficient support among MPs to get it passed so the UK can depart by the current October 31 deadline.

But, with no Commons majority, Mr Johnson faces a major battle to achieve his cast-iron pledge.

Labour has denied it is trying to scupper the PM’s agreement by planning to amend it to secure a customs union and a second referendum as the legislation passes through Parliament.

Shadow health secretary Jonathan Ashworth told Today: “We are not attempting to wreck it, we are attempting to safeguard the British economy, safeguard jobs and safeguard public services.

“We believe that the responsible way in which to leave the European Union is in a customs union arrangement and that, in turn, should be put to the British people so they can have a say on this.”

Number 10 is opposed to a customs union and second referendum, and warned that if the legislation in the Commons “steps too far away” from what has been agreed with the EU then it would “bring into question ratification”.

Meanwhile, judges at Scotland’s highest civil court who have been asked to rule whether the PM lawfully complied with the Benn Act delayed making a decision until it becomes clear to them it was “complied with in full”.

Mr Johnson was forced to send the letter under the law passed by MPs trying to fend off a no-deal Brexit because MPs did not support his deal by the Saturday deadline.

But he signed a second letter saying a delay would be a mistake, and judges at the Court of Session in Edinburgh are to resume at a later date.

The letters were sent after former Tory minister Sir Oliver Letwin handed Mr Johnson an embarrassing defeat in the Commons.

Sir Oliver, who was among the rebels exiled by Mr Johnson over their attempts to stop a no-deal, successfully tabled an amendment which effectively forced the PM to ask for a delay.

As Parliament demanded in the Benn Act, Mr Johnson wrote to European Council president Donald Tusk requesting an extension to the end of January.

The PM did not sign the letter, and sent a second communication insisting that a delay would be “deeply corrosive” for the UK and the EU.

Labour accused Mr Johnson of behaving like a “spoiled brat”.

Meanwhile, the EU’s process for ratifying the Brexit deal has begun, European Commission spokeswoman Mina Andreeva said.

Nicola Sturgeon and Mark Drakeford, the Scottish and Welsh First Ministers, warned Mr Johnson’s deal would be “more damaging” than Theresa May’s as they called for him to allow Parliament and the devolved legislatures sufficient time to scrutinise the Bill.

They also wrote to EU Commission president Jean-Claude Juncker supporting the extension request so the Wab can be scrutinised and that a confirmatory referendum can be held.