Priti Patel has slapped down the chancellor's claims that a no-deal Brexit would be "damaging".
The Conservative MP and former international development secretary said it was "not acceptable" for Philip Hammond to warn Conservative leadership hopefuls against leaving the EU without a deal.
"I never want to run my colleagues down, certainly not the chancellor," she told talkRADIO's Julia Hartley-Brewer. "But I think it's wrong to effectively make remarks that rule out what the British public voted for."
She continued: "I don't think it is acceptable anymore to constantly rule out no deal. We had a Prime Minister who said over 100 times no deal is better than a bad deal."
Mr Hammond is set to make the comments at tonight's annual CBI dinner, and he is expected to say that supporters of no deal are trying to "hijack" the result of the EU referendum.
But Commons leader, Andrea Leadsom, has also hit back at his claims about the consequences of a no deal.
"We voted, 17.4 million of us, to leave the EU. There weren't conditions attached," she told the talkRADIO breakfast show. "The default position is that if we don't have a deal by October 31, then we will leave without a deal."
"I don't think he has made his speech yet, but clearly what the government is trying very hard to do is to get a deal across the line that delivers Brexit."
She added: "The fact is if we can't get a deal across the line, then we leave in October."