Conservative MPs have been told they must be in Westminster on Monday – leading to speculation a new Brexit deal is to be announced.
Tory MPs will be on a three-line whip on Monday, meaning all 355 of them must be in parliament for a possible important vote.
If they defy the order, they could have the whip withdrawn – meaning suspension or even being expelled from the party.
Three-line whips – named because instructions on how to vote are underlined three times to emphasise importance – normally only apply to major events such as the second readings of significant bills.
MPs have not been told exactly why they have been given a three-line whip to be in on Monday but Rishi Sunak has been negotiating a new Brexit deal for Northern Ireland all week with the EU.
The likelihood of an announcement was further boosted on Friday after sources in London and Brussels said an evening call between the prime minister and European Commission President Ursula von der Leyen was “positive”.
A Downing Street source said there had been “good progress” and The Times said cabinet ministers have been put on alert for a possible conference call over the weekend.
The DUP has refused to be part of Stormont’s power sharing government because of the Northern Ireland Protocol, meaning there has been no functioning assembly there for a year.
It has laid down seven “tests” a new plan will have to pass, including no Irish Sea border.
Critics of the existing protocol say a border has effectively been created due to checks having to be carried out on goods coming from the rest of the UK into Northern Ireland because the country shares a land border with the EU in Ireland.
The DUP also wants no checks on those goods at all.
Foreign Secretary James Cleverly indicated ministers will not sign off on a deal until the DUP’s concerns are addressed.
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DUP: ‘This is an historic moment’
Three likely changes
What exactly could be in a new deal for Northern Ireland has been kept under wraps during the negotiations.
Sky News’ Deputy Political Editor Sam Coates said three key changes are likely to form part of the agreement.
They are:
• Businesses that have signed up to a “trusted trader scheme” will be allowed to avoid all checks when moving goods from the GB mainland to Northern Ireland. In exchange, the EU will be able to access “real-time” UK data on trade flows across the Irish Sea
• The “Stormont Lock” will see the EU have to give the UK notice of future EU regulations intended for Northern Ireland. The Joint Ministerial Committee will then be able to lodge an objection, which may then result in the EU voluntarily choosing to disapply the regulation in Northern Ireland
• Control of the so-called level playing field of measures, like VAT rates and state subsidy policy, will revert to Westminster.