Rory Stewart becoming Prime Minister would be good news for the Brexit Party, according to its chairman Richard Tice.
The newly-elected MEP said Mr Stewart's stance against leaving the EU without a deal would further fuel support for the fledgling Brexit Party, which has existed for just five months.
"No one can be worse than the current leader, that's for sure," Mr Tice told talkRADIO's Julia Hartley-Brewer.
"If it was Rory Stewart, that would help the Brexit Party enormously, but I am thinking of the country first, and the country needs leadership. It needs Brexit to be done and dusted, as has been promised numerous times."
Yesterday, MPs began voting on who they wanted to become the next Tory leader and Prime Minister, with Mr Stewart scraping through the first round with 19 votes.
The candidate called his seventh place result "amazing", and suggested it would come down to him and frontrunner Boris Johnson as contenders are whittled down over the coming weeks.
"It's quite extraordinary what he is contemplating and saying," Mr Tice added. "He thinks he is a serious candidate for the leadership."
"People like Rory Stewart - yes he might be very intelligent - but he somehow thinks he and a few other MPs have got the right to stop the democratic wishes of the people, as expressed in the referendum."
Mr Stewart has spoken out against a no-deal Brexit, and vowed to set up an "alternative Parliament" if one were to occur without a Commons vote.
Mr Tice continued: "Parliament did give this decision to the people, so all the suggestion that Parliament can now stop it, that is unconstitutional. It is immoral.
"It is not for Parliament to decide whether or not we leave."