Theresa May has told the BBC that MPs will have a choice between her proposed deal with the EU – or no deal at all.
In an interview with Panorama, she was also critical of plans by Brexiteers to resolve the Irish border issue.
But ex-foreign secretary Boris Johnson claims the government’s failure to resolve the border question has led to a “constitutional abomination”.
A BBC-commissioned survey indicates more people across the UK think the impact of Brexit will be negative.
Speaking to Panorama, Mrs May said that if Parliament does not ratify the Chequers plan “I think that the alternative to that will be having no deal”.
BBC political editor Laura Kuenssberg said Theresa May calculated that faced with a “binary choice” of the Chequers deal or no deal, Brexiteers would not have the “chutzpah to say ‘no way'” and Remainers would decide that carrying on fighting the plan would be too risky.
But the risks are that the PM cannot say for certain what the final deal will look like – and some Brexiteers were already determined not to vote for it, she added.
The UK is set to leave the EU on 29 March 2019, and negotiations between the two sides are still taking place.
Mrs May set out her proposals for the key issue of cross-border trade after a Chequers summit in July, but it has been fiercely criticised by some Brexiteers who say plans for a “common rulebook” on goods would compromise the UK’s sovereignty.