Richard Tice has insisted the Brexit Party will continue to exist, despite the appointment of a Brexiteer Prime Minister.
The MEP and Brexit Party chairman said the appointment of Boris Johnson this week did not mean his party was now redundant.
"Let's not forget that Boris himself, after talking about vassalage and slave state, he voted for the dreadful Withdrawal Agreement on the third time of asking," he told talkRADIO's Julia Hartley-Brewer.
"There is so much more to be done and many millions of voters out there are looking for something different."
Mr Johnson appointed his Cabinet last night, which included a large number of Brexit-backing politicians.
Among them was arch-Brexiteer, Jacob Rees-Mogg, who was named Commons leader, as well as Priti Patel as Home Secretary.
And Leave campaigner Michael Gove was appointed Chancellor of the Duchy of Lancaster.
Mr Tice continued: "It was Nick Boles himself describing this new Cabinet as Brexit Party Cabinet, so it just shows the influence we have had on British politics and history.
"I do find it slightly amusing that Michael Gove - who tried to sell the worst deal in history to the country - is now in charge, it appears, of no deal preparation."
He added: "We are here to stay and continue making that difference... We set out a clear slogan that we are here to change politics for good."