He said the withdrawal deal was "fair and balanced" and both sides "want to avoid using the backstop", the key sticking point for Brexiteers in the United Kingdom, because it would allow the EU to trigger a back-up plan of keeping the United Kingdom within its Customs Union if an amicable trade agreement for the future is not struck within the transition period - set to run until December 2021.
He added: "I find it impossible to believe that the Secretaries of State of exiting European Union, whether it's David Davis or Dominic Raab, were not aware of the sort of direction in which this negotiation was going".
Ms Rudd pleaded with Tory rebels to back the Prime Minister and her Brexit deal on her return to Government as the new Work and Pensions Secretary, saying: "This is not a time for changing our leader".
More than 20 lawmakers have said publicly that they have done so, but others are thought to have submitted letters confidentially. In a BBC radio interview on Sunday, he didn't sound like someone on the brink of unleashing political chaos.
Prime Minister Theresa May's suggestion that issues with the Brexit deal can be remedied in talks over its future ties with the bloc are "a tragic illusion" or "an attempt at deception", former Foreign Secretary Boris Johnson said.More news: White House to Revoke Acosta’s Press Pass Again at End of Month
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"That would ensure no hard border in Northern Ireland and avoid the need for the government's half-baked backstop deal".
"No deal better than the one on the table can be reached", Germany's European affairs minister, Michael Roth, said.
He said he voted Remain in the 2016 referendum but if there were to be another, he said: "I don't know how I would vote - what the options would be at that time".
"We won't agree the leaving part, the withdrawal agreement, until we have got what we want in the future relationship because these two go together. I want the future relationship to be in place on 1 January 2021". It would mean more division, more uncertainty and a failure to deliver on the vote of the British people, ' she added.
Mr Mundell said he has reservations about the Prime Minister's draft Brexit deal but other alternatives were "even more unpalatable". "Surely, surely we can go better than this".
Mrs May's deal faces the prospect of being voted down in the House of Commons given the fierce opposition to her withdrawal plan puts a majority in doubt.
CBI president John Allan said such a Brexit would be a "wrecking ball" for Britain's economy while CBI director-general Carolyn Fairbairn said politicians were playing a high-stakes game that could lead to an accidental, no-deal departure.
"The government have to go back to the European Union and renegotiate rapidly", he said, adding that second Brexit referendum was "an option for the future" and "not an option for today". "What's the question going to be?"