Theresa May is to chair a meeting of some of her senior ministers to try to make progress on stalled EU talks.
They are expected to discuss how much the UK should offer to pay the EU to settle its bill as it leaves.
This bill, which is likely to run into billions of pounds, is one of the main reasons for the logjam in negotiations between the UK and the EU.
Downing Street dismissed reports the UK could double its initial offer to the EU to £38bn.
The UK’s offer so far is estimated to add up to about £20bn.
What is the bill for?
The EU says the UK needs to settle its accounts before it leaves. It says the UK has made financial commitments that have to be settled as part of an overall withdrawal agreement.
The UK accepts that it has some obligations. And it has promised not to leave any other country out of pocket in the current EU budget period from 2014-20.
But the devil is in the detail.
There are also issues like pensions for EU staff, and how the UK’s contribution to these is calculated for years to come, and the question of what happens to projects that will only begin after the UK has left.
Talks have stalled so far
The EU says it will not discuss a new trade deal with the UK until issues like the “divorce bill” have been settled, and has given Mrs May a deadline of early December to increase the UK’s offer.
The issue of the Irish border and what happens to EU and UK citizens living in each other’s countries also needs to be settled.
Speaking on BBC Breakfast, Business Secretary Greg Clark said the amount the UK was prepared to offer should only be discussed in private because the UK had to “exercise discipline” in the negotiations.
On Sunday the chancellor, Philip Hammond, said the UK would come up with proposals in time for the crunch summit in mid-December, where the EU will decide whether to move the negotiations on to talking about future issues like trade.
He promised Britain would honour its debts but also “negotiate hard” on the various aspects of the financial settlement.
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