Theresa May faces a crunch cabinet meeting later as she tries to win colleagues' support for a draft Brexit agreement between the UK and EU.
Senior ministers will gather in Downing Street at 14:00 GMT amid calls to reject the deal from both senior Brexiteers and some Remain supporters.
The Democratic Unionists have warned it could lead to the break-up of the UK.
But the BBC's Norman Smith said No 10 were stressing it had pushed "right to the wire" and "gone as far as we can".
Okay dokey. The draft agreement hasn't been published yet, but it will likely contain the following:
The UK will stay aligned with EU law and have no say in how that law is made.
The UK will stay aligned to the customs union for a "limited" time, so as to not prevent a hard border in Ireland.
The UK will allow some movement of EU jobseekers
The UK will pay £40 billion pounds for this immense privilege.
Somebody on tv just used the analogy that this deal is like going into Tescos with a trolley filled with the billions and coming out of the shop with a empty trolley and not even being allowed to use your clubcard.
The Cabinet is to discuss the text later with May seeking their approval for the deal. If they agree, the EU will publish the 500 page text later. Next step, a EU conference on the 25th November where EU leaders either approve the deal or not. Finally, if the deal is approved, Parliament gets to vote on it before Christmas. This is meant to be the "meaningful" vote that all MPs wanted.
On Newsnight last night were Jacob Reece-Mogg, Dominic Grieve and Chuka Umunna, strange bedfellows, but for once they were united. They all said they would not approve the deal for the simple reason it is incomplete. They stated, how could they approve the text when they have no idea what the future relationship with the EU will look like.
Will it be a deal or no deal?