Philip Hammond, the chancellor, said it was "terrifying" that one of Boris Johnson's close allies, Jacob Rees-Mogg, believed that a Brexit without agreement would improve the economy.
The chancellor, who is due to leave the government next week, expressed his horror after Rees-Mogg used an opinion article by the Daily Telegraph to reject the "sheer stupidity" of the Treasury's forecasts suggesting a 90 billion coup pounds for the economy.
Rees-Mogg stated that they were economic models that indicated "the total positive impact of no agreement could be in the region of around 80 billion pounds".
Hammond responds to the topic, saying on Twitter: "I am happy to discuss the extent of the negative impact of no economic agreement – but terrifying that someone so close to a potential future government might think we would really be better adding barriers to access to our largest market. "
Rees-Mogg told the Guardian that this was part of the "fear project", which claimed to have been "constantly wrong," adding that his article clarified that the "barriers to trade that the chancellor worries about would be against the rules of the 39; World Trade Organization, "while ignoring the benefits of future trade agreements".
The clash highlights the problems facing Johnson who could have as prime minister if he wins the Tory leadership race next week.
He said he wants an agreement with the EU to withdraw the Northern Ireland blockade by the end of October, but if that fails, many of his Eurosceptic supporters are eager to proceed with a Brexit without agreement.
Hammond is one of the many old tories of the other wing of the party who will fight hard against this result, and the chancellor even suggests that he could vote for his government to stop it.
Johnson did not rule out the prorogado of parliament to get an exit without agreement, but Andrea Leadsom, one of his supporters, suggested that he was among those who would not support him and did not believe he would go and get him.
Stephen Barclay, Secretary Brexit and a Johnson supporter, told the commissions committee on Wednesday that Brexit without agreements is "undervalued" and believes preparations should be accelerated.
Following news that clashed last week with Michel Barnier, the chief negotiator of Brexit, telling him that the EU withdrawal agreement was dead, Barclay said that this is not "a & # 39;" controversial observation ".
"In terms of the withdrawal agreement, what I said was that the Assembly rejected it three times, including the third time with a significant margin; that I think the results of the European elections have further strengthened the attitudes throughout the house and that the text, unchanged, did not include passing through the house, "he said.
He said: "A Brexit without agreement would be disruptive", but added: "No Brexit is the worst of these two results".
Barclay also revealed that the government was trying to compensate sheep farmers for Brexit without agreement, following warnings from the National Farmers Union that the shepherds would be forced to slaughter their flocks because there would be no market for their meat.
He said the sheep meat industry was an "outlier" because 97% of exports went to the EU, but the government was working on intervention and compensation measures.
Barclay expressed his opinion that Parliament would be invited to vote on any new agreement reached by the next prime minister, and if he was rejected, he would have been offered the opportunity to revoke the Brexit or leave without an agreement.
"But the question then will be: is it an agreement that is pleasing to the Parliament and if not the parliament will vote for the revocation or will we leave without an agreement?"
However, any premier coming down that path could face a no-confidence motion first. The Tory backstories fighting a tough Brexit, including Hammond, Dominic Grieve, Justine Greening and Guto Bebb, should consider voting to bring down their government and risking a general election rather than allowing the UK to leave without conditions. .
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