Jacob Rees-Mogg said the deal Theresa May agreed with her Cabinet could be “worse” than a “no deal” Brexit and suggested it broke the Conservatives’ manifesto promises.

Mr Rees-Mogg, the leader of a 60-strong group of Eurosceptic Tory MPs, said tying the UK with EU rules and regulations could make “trade deals almost impossible”.

“As with eggs: an egg that is very softly boiled isn’t boiled at all,” he said, speaking on BBC Radio 4’s Today programme. “A very soft Brexit means that we haven’t left, we are simply a rule-taker.

“That is not something that this country voted for, it is not what the Prime Minister promised.”

Mr Rees-Mogg said he was waiting to see the full details of the proposals to check if Theresa May’s previously-drawn red lines had turned “pink” but said that if the legislation shows it will be a "punishment Brexit" then it will be effectively "keeping us in the European Union in all but name".

"The Prime Minister will, I'm sure, stick to her word - that is crucially important - but I will certainly stick to the Conservatives' manifesto commitments and will not vote for something that doesn't deliver Brexit."

“It is possible that this deal is worse” than a “no deal” Brexit, Mr Rees-Mogg said.