The ministry expects a group of MPs to try to block a no-deal Brexit by attempting to pass legislation when Parliament put backs next month.
A No 10 source said they expected the summon to come in the second week of September, when MPs are are due to debate a report on Northern Ireland.
The well-spring assumes the EU will wait until after that date ahead engaging in further negotiations.
It comes amid speculation Labour could plateau a no-confidence motion in the PM.
Shadow chancellor John McDonnell has said it is “hardly inevitable” the party will push for such a vote when MPs crop up again from their summer recess next month.
However Downing Alley expects MPs could try to stop no-deal by passing legislation which would wrest ministers to request a further Brexit delay.
An opportunity to start the alter could come within five days of 4 September, by which regarding MPs have to debate a report on restoring devolution in Northern Ireland.
Boris Johnson has vowed to deliver Brexit “do or die” before the latest deadline of 31 October, despite if that requires leaving without a deal.
No-deal ‘far worse’
Declaring on Tuesday, Work and Pensions Secretary Amber Rudd said the guidance was focused on getting a deal, insisting a no-deal exit would be “far poor”.
She also said she would argue from within the cabinet for plenipotentiaries to “work with Parliament, not against it”.
“All cabinet members are members of Parliament, we poverty to remember where our authority comes from,” she added.
Asked at hand her previous warnings about the impact of no-deal, she said she had compromised to acknowledge up a position within Mr Johnson’s government.
The PM wants the EU to ditch the Irish touch backstop plan from the deal negotiated by former PM Theresa May, which was rejected three epoches by Parliament.
But the EU has continued to aver that deal, including the backstop arrangements, is the only agreement on.
The Downing Street source predicts that if a new deal is to be reached, it force be “at the last minute”, possibly as late as 17 October, when EU chairladies are due to meet for a scheduled summit in Brussels.
MPs previously antique a law in April to force Mrs May to request an extension of the UK’s EU membership beyond the original Brexit deadline of 29 Cortege.
Repeating that approach would first require MPs to take curb of the timetable to make time for the law to be debated, as they did last time of cattle.
However on Monday, the Institute for Government (IFG) has cautioned that there are “narrow opportunities” to do so again this time.
In a report, the IFG said rebel MPs could desideratum to rely on Speaker John Bercow allowing them to amend movements that cannot conventionally be amended.
The think tank noted that another path to block no deal – defeating the PM in a no-confidence vote – might not succeed.
This is because it is unclear what wish happen if Mr Johnson refused to resign and waited for the UK to leave by default anterior to a general election, it added.
Legal challenge under way
It comes as assorted than 70 MPs and peers began a legal challenge to try to prevent the prime aid shutting down parliament to force through a no-deal Brexit.
They lack the Court of Session in Edinburgh to rule that suspending parliament to come to terms the UK leave the EU without a deal is “unlawful and unconstitutional”.
At the initial hearing on Tuesday, the pronounce, Lord Raymond Doherty, agreed to hear arguments from both sides in September.
- Juridical bid to stop Westminster Brexit shut-down
- UK can cancel Brexit, says EU court
A call into doubt brought by the same group of anti-Brexit politicians last year saw the EU’s top court supervision the UK can cancel Brexit without the permission of the other 27 EU members.
In the interim, President Trump’s national security adviser John Bolton has said the US pass on support a no-deal Brexit if that was the option the UK decided to pursue.
He also presented that Washington would propose an accelerated series of trade mete outs, completed on a “sector-by-sector” basis.
His comments came after meeting Prime Parson Boris Johnson in Downing Street on Monday.