Lord Frost seemingly welcomed GB News presenter Nigel Farage into the conservative brand, saying he is a "natural" part of the movement.
This comes amid growing speculation over Farage's political allegiance, with the former Brexit Party leader choosing to attend the Conservative Party Conference this year for the first time in 30 years.
WATCH: Lord Frost says Farage is a 'natural' conservative
Asked whether Rishi Sunak should start listening to Farage, given his significant popularity, the former Brexit negotiator said: "Well, I think what Nigel taps into is that. I mean people could see in many ways he is a conservative.
"Obviously he believes in many of things I believe in - free markets, low immigration, all these these kinds of things and people can see that.
"So he's a natural part of the right movement in this country, which unfortunately has got divided between different parties.
"But, but I personally think the more people who are out there arguing for what I think, the better things are."
Speaking at the Conservative Party Conference in October, Sunak suggested he would welcome Nigel Farage back into the Party.
The PM told GB News the Tory Party is a "broad church", adding that he "welcomes lots of people who want to subscribe to our ideals".
Lord Frost's interview with GB News also saw him dismantle Sir Keir Starmer's plan for an EU pact on migration, outlining some of the major tradeoffs the party would have to make in order to get the deal over the line.
Speaking to GB News at the Alliance for Responsible Citizenship (Arc) Conference in London, Frost warned that the UK would have to "pay a price" if it wants to secure a return deal with the bloc.
He said this could involve either the acceptance of EU laws or a financial cost.
The Labour leader unveiled his new plan to tackle illegal migration earlier this year, which is expected involve a cross-border approach to tackling the gangs.
He said he is planning to seek an EU-wide returns agreement for asylum seekers who arrive in Britain.