Nigel Farage has claimed Douglas Carswell is actively seeking to damage UKIP and has called for him to be expelled from it.
The former leader of the party has blasted the MP for Clacton - UKIP's only member of parliament - as claims of Carswell frustrating the process for him to receive an honour continue to circulate.
Lord Pearson of Rannoch tried to organise a knighthood for Farage, but when this was rejected, he approached Carswell in order to appeal the decision to the chief whip Gavin Pearson.
Emails leaked to the press show the UKIP MP writing to the peer: "As promised, I did speak to the Government chief whip. Perhaps we might try angling to get Nigel an OBE next time round? For services to headline writers? An MBE, maybe? Let's discuss."
Farage claims the emails show a Douglas Carswell who is "consumed with jealousy", with a "desire to hurt" him, and insisted Paul Nuttall expelled the MP out of UKIP.
Writing in The Telegraph, he said: "As a party, how can we let a man represent us in the House of Commons who actively and transparently seeks to damage us?
"I think there is little future for UKIP with him staying inside this party. The time for him to go is now."
Carswell disputed this, telling the Press Association showed he tried his best to get the honour for Farage.
He said: "If he wants to come and talk to UKIP about it, we are happy to put it on the agenda for Monday's meeting.
"I'm delighted where I am. If he wants to come and talk to the UKIP Parliamentary Party about any concerns he has, I'm very happy to respond.
"It won't take long, it's just me."