Theresa May has been hit with a fresh resignation as a ministerial aide quit over her ‘watered down’ Brexit plans.
Scott Mann, a parliamentary private secretary as the Treasury, said elements of the Chequers agreement meant he would have to “compromise” on the wishes of his constituents.
It came as Sir Bernard Jenkin said the prime minister’s blueprint is “neither beloved by Remainers or Leavers” and claimed was “quite likely” to rejected by the European Union.
Justine Greening, a former cabinet minister, also suggested the proposals for the UK’s future relationship with the bloc offered to “worst of both worlds” as she became the most high-profile Conservative MP to back a fresh referendum.
Later on Monday, MPs are expected to vote on the remaining stages of the customs bill.
While a number of amendments have been put down – from both the Eurosceptic and pro-EU wings of the Conservative party – the crucial vote will be at the bill’s third reading with ministers being uncertain they have the votes to pass the legislation.
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Meeting government targets on immigration means £12bn hit to public finances, say Global Future"The amendments are to a bill that is designed to prepare for the world after Brexit, to be able to establish new customs regime that will be necessary," he said.
"So I would hope and expect that those of my colleagues that want to get on with Brexit would recognise that this bill is essential."
Asked about the chances of success for Ms May's strategy, Mr Clark continued: "This is a white paper that is now the basis of our negotiation. What I hope is that the EU should now respond positively to that.
"If, as I expect, that happens and we have a comprehensive deal that can be put before parliament - and there had been a commitment to have a meaningful vote - what comes with that is the certainty for working people right across the country that will be able to invest with confidence, will be able to create new jobs, that implementation period will be available.
"All of that hinges on that being agreed this autumn and, I think, when it comes to parliament, I hope and expect that it will be persuasive that what is on offer will be good for the UK and good for every part of the UK."

Brexit: Theresa May suffers eighth resignation over her negotiating strategy
Robert Courts was a ministerial aid at the Foreign Office before quitting
Ex-cabinet member Justine Greening becomes first senior Tory to openly call for a second Brexit referendum
'This deal is a fudge I can’t support', says former education secretary