Theresa May must deliver the Brexit she promised or risk collapsing the government, a leading Brexiteer has warned ahead of crucial Cabinet talks on the UK's exit strategy.
Jacob Rees-Mogg said the Prime Minister and her top team must decide at a meeting at Chequers on Friday if they would stand by her pledges or reduce "a once-proud country" to a "tremulous state that sees Brexit as mere damage limitation".
It comes as Downing Street was reportedly preparing to discuss a third model for post-Brexit trade with the Cabinet in a bid to overcome disagreement on the issue.
Meanwhile Mrs May faces repeated warnings that senior figures in her government are on manoeuvres in preparation for a leadership battle.
Writing in The Daily Telegraph, Mr Rees-Mogg warned the PM she was in danger of splitting the party like Sir Robert Peel, who plunged it into the political wilderness for nearly three decades following bitter divisions over trade reforms.
The chairman of the European Research Group of Brexit-backing Tories said: "Theresa May must stand firm for what she herself has promised.
"One former Tory leader, Sir Robert Peel, decided to break his manifesto pledge and passed legislation with the majority of his party voting the other way.
"This left the Conservatives out of office for 28 years.
"At least he did so for a policy that works. At Chequers [Mrs May] must stick to her righteous cause and deliver what she has said she would, she must use her undoubted grace to persevere."
Listen to Simon Clarke, MP for Middlesbrough South and East Cleveland, discuss a possible Brexit mutiny with Julia Hartley-Brewer on talkRADIO.
It comes as the PM's chief Brexit official reportedly told ministers they have no chance of striking a bespoke trade deal with Brussels.
Briefing Cabinet ministers ahead of the Chequers talks, Oliver Robbins is said to have painted a bleak picture of the situation, with a source telling The Times they came out of the meeting thinking "we were even more screwed than we were before".
Business Secretary Greg Clark and Commons leader Andrea Leadsom both refused to rule out an extension to transition arrangements in the face of demands from Tory backbenchers for the timetable to be maintained.
Mr Clark said the decision must be "guided by the facts and the evidence" and Mrs Leadsom said December 2020 was not a "magical date".
Mrs May will bring together her Cabinet at her country residence to thrash out details of a white paper setting out the UK's plans for areas such as trade.