Nigel Evans has claimed division in Westminster is making the prospect of securing a deal with the EU less likely.
The Conservative MP said backlash to Boris Johnson's decision to prorogue Parliament and his general "do or die" approach to delivering Brexit was unhelpful in negotiations.
"Can you imagine what would happen in Brussels if for instance Ken Clarke, Dominic Grieve and a small number of others on my own side actually got behind their own Prime Minister?" he asked talkRADIO's Julia Hartley-Brewer.
"All of a sudden I think you would find they'd want to talk. We have already seen some shifts within Brussels because they can see the determination in the face of Boris Johnson and the team he has got around him."
Highlighting the scope of the division within the Conservatives, Tory grandee Ken Clarke announced yesterday that he would "probably" support Jeremy Corbyn as a temporary Prime Minister, on the condition there wasn't "the slightest chance of implementing any bits of his Labour manifesto".
But Mr Evans said the comments made him question Mr Clarke's sanity.
"I say to my colleague and friend Ken Clarke - are you absolutely out of your mind?.
"If you think it is the right thing to do to vote against Boris Johnson, who was democratically elected by the membership of our party, in order to put Corbyn into Number 10 to stop what the people voted for in 2016... just think of the sequences of everything I have just said Ken."
He pleaded: "For goodness' sake, do not do this."