UKIP leader Nigel Farage has been frozen out of cross-party talks which will negotiate Britain leaving the European Union.
Farage was expected to be central to negotiations in both his role as an MEP and as a prominent Brexit campaigner.
But the official Vote Leave campaign headed by Boris Johnson and Michael Gove was quick to distance itself from Mr Farage.
A senior Vote Leave source said: “Nigel Farage’s involvement has come to an end.”
“I have tried for nearly a year to work with these people and fight on a common agenda and they don’t want to know.”
Ukip MEP Mike Hookem said the party’s 24 representatives in Brussels, including leader Nigel Farage, should be central to the negotiations.
He said: “It would be lunacy for Nigel Farage not to be involved in our renegotiation.
“And he is the elected politician with the most experience and knowledge of Brussels and of the Brussels process, having sat on the European Parliament’s Conference of Presidents since 2004.”
He added: “Yes we have achieved our Brexit aims of an independent United Kingdom, but the mandate we were given as MEPs by the voters is to stay there until the day we leave to ensure the best interests of the country.