Ann Widdecombe has accused the government of not taking the Brexit Party "particularly seriously".
The Brexit Party MEP said her party could be a valuable ally to the government in an upcoming election by targeting "big Leave seats".
"I have no doubt at all that we can deliver in big Leave seats where the people are feeling let down, either because their MP is from a party like the Lib Dems or Labour, who have gone against the referendum result, or indeed because their individual MP is a rebellious remainer within the Conservative Party," she told talkRADIO's Dan Wootton.
Yesterday, the Prime Minister announced he would be pushing for a December 12 election.
He will require a two-thirds majority in Parliament in order to get his plans through in a vote scheduled for Monday.
"We would certainly support December 12," Ms Widdecombe continued. "As far as we are concerned it would be a means to get Brexit done."
But the former Conservative MP said an election would be a "disaster" without a Brexit Party pact.
"We have made an offer to Boris. We made it very clear that if he will agree to go for a clean break then we, in turn, will help him get a thumping great majority in the election," she said.
"I don't think they were ever taking us particularly seriously and that has been the problem throughout. They were very dismissive. Dominic Cummings was haughty about it and so was Boris."