With the Brexit deal thrashed out in principle between the UK and EU negotiating teams, Theresa May now faces the tough challenge of getting her Cabinet to support it.
Here are the Cabinet ministers who Number Ten fear could walk over the agreement, and an assessment of how damaging their departures could be.
The Work and Pensions Secretary Esther McVey (pictured in Downing St today) is one of the Cabinet’s leading Brexiteers
Esther McVey, Work and Pensions Secretary
Ms McVey is one of the cabinet’s leading Brexiteers.
She was said to have been unhappy at the way the Brexit talks were heading fearing that the plan for an Irish border backstop could keep Britain trapped inside the EU customs union.
She was only promoted to the Cabinet in January this year, is not a household name, and did not play a big role in the Leave campaign as she did not have a parliamentary seat when the Brexit referendum was run.
Damage score: 4/10
As Britain’s second Brexit Secretary in six months, Dominic Raab (pictured in Downing Street today) is a central player in the Cabinet
Dominic Raab, Brexit Secretary
As Britain’s second Brexit Secretary in six months, Mr Raab is a central player in the Cabinet.
The ardent Brexiteer was one of the faces of the Vote Leave campaign, and was promoted to his post in June after David Davis quit in fury at the Chequers plan.
While he has maintained his loyalty to Theresa May publicly, he has been a fierce critic of EU blocking the UK from ensuring it could leave the EU customs union unilaterally. Losing a second Brexit Secretary in six months would be hugely damaging to the PM.
Damage score : 9/10
Andrea Leadsom (pictured in Downing Street last month) was a leading face with Vote Leave
Andrea Leadsom, leader of the Commons
Another leading campaigner with the Vote leave campaign, she had been a contender for the Tory leadership before withdrawing – clearing the way for Theresa May’s coronation.
She is a committed Brexiteer who has largely kept out of the rows over the PM’s strategy. But she pointedly refused to back Mrs May to stay on as Prime Minister in the long-run last month.
Damage Score: 6/10
Michael Gove (pictured in Downing St yesterday) was the frontman of the Vote Leave campaign alongside Boris Johnson
Michael Gove, Environment Secretary
Alongside Boris Johnson, Micheal Gove was the frontman of the Vote Leave campaign – breaking ranks with his long-time and close friend David Cameron to campaign to quit the EU.
After the resignations of Mr Johnson and David Davis, he is one of the final leading Brexiteers still sticking with Mrs May and in the Cabinet.
His resignation would be a body bow to the PM – and a sign that she had finally lost support of most of the Brexiteer wing of her party.
Damage Score: 9/10
Penny Mordaunt (pictured in Downing Street) never explicitly backed Theresa May’s Chequers Brexit plan – only saying that she backed the PM.
Penny Mordaunt, International Development Secretary
A leading Brexiteer popular with Tory MPs, Penny Mordaunt was promoted to the Cabinet last November.
She never explicitly backed Theresa May’s Chequers Brexit plan – only saying that she backed the PM.
She is often named as one of the Cabinet ministers most likely to walk over Brexit – but if she does go she risks cutting her cabinet career short.
Damage Score: 5/10
Liam Fox (pictured in Downing Street yesterday) long-time Brexiteer, he was one of the trio of leading Eurosceptics – alongside Boris Johnson and David Davis – elevated to the Cabinet after Theresa May was made Tory leader
Liam Fox, International Trade Secretary
A long-time Brexiteer, he was one of the trio of leading Eurosceptics – alongside Boris Johnson and David Davis – elevated to the Cabinet after Theresa May was made Tory leader.
He has largely stayed out of the political Brexit rows which have plunged the PM’s government into one crisis after another.
But if he did quit it would show that Mrs May is losing her influence over the Brexiteers.
Damage Score: 6/10