A furious caller to Anna Soubry's LBC radio show says he is "disgusted" by her decision to leave the Conservatives.
Soubry, along with two colleagues, quit the Tories on Wednesday over the party's position on Brexit and joined the Independent Group, former by Labour rebels on Monday.
That infuriated Neil, who called in as she hosted her own LBC show, standing in for James O'Brien.
Urging her to call a by-election, he said her constituents in Broxtowe "didn't vote for you as an independent member. They voted for you as a Conservative".
Soubry insisted her views, values, and principles had not changed, adding: "If it had changed, I think you'd be making a very good point. The problem is the Conservative Party has changed.
"So I don't think we need a by-election. The only vote I think we need is a People's Vote."
Neil them shouted at her: "You're being duplicitous, aren't you. You are out to derail Brexit.
"People like you disgust me. You disgust me. You're being two-faced and if you've got any respect for democracy at all, you'll go back to your electorate and ask them to support you.
"And you're frightened of that. They'll throw you out."