Nigel Farage has said a Ukip leadership battle would be a "massive, massive mistake" and dismissed the current row within the party as "people letting off steam".
Speaking on BBC Question Time, Farage said the "level of support for me in the part is phenomenal" and claimed any change in leadership would be a bad idea with an EU referendum due, potentially as soon as May 2016 in his view.
He said he was "disappointed" that colleague and party economic spokesman Patrick O'Flynn had accused him of becoming a "snarling, thin-skinned, aggressive" man, but said it was a result of the election campaign creating "a huge amount of pressure".
"I'm sure the others would agree, and we maintained discipline as a party extraordinarily well during this general election compared with the past. The election's over, people are letting off steam, and we've seen one or two people fighting personal wars against each other."
Nigel Farage has told ITV News he believes he has lost the confidence of his party.
Asked when arriving for tonight's BBC Question Time, Farage replied: "Big time".
However, the Ukip leader decline to say whether he would resign from the party leadership.
Ukip spokesman Patrick O'Flynn should resign over his "wholly unprofessional" comments about Nigel Farage, the party leader's outgoing chief of staff has said.
It was confirmed today that Raheem Kassam had left his job, but Mr Farage's former adviser insisted that his contract was always due to expire at the end of May.
"I wish Nigel all the best, Nigel is clearly the best person to lead the party; he's clearly the best communicator in British politics and for Patrick O'Flynn to call him 'snarling' I think shows what sort of pedigree Patrick O'Flynn has in politics," he told Sky News.
Kassam revealed that he is returning to journalism with Breitbart London where he would "scrutinising quite heavily what the red Ukip team are trying to do with the organisation".
The future of Nigel Farage remains in doubt today as leading Ukip figures row over whether he is the right man to take the party forward.
Much of the argument centres around a team of advisers around the party's leader, who have moved on since the argument hit headlines.
However, as ITV News Deputy Political Editor Chris Ship reports, that does not appear to satisfy some in the party, who are calling for him to step aside - again.
Richard Desmond, the owner of Express Newspapers who donated £1 million to Ukip during the campaign, has said the party's leader Nigel Farage "has my support 101%."
Alan Bown, a major donor who has given almost £2 million to Ukip, has backed Nigel Farage to remain as leader.
In a short statement on the party's website, Bown said had "first got involved because of Nigel", adding that the leader "speaks for ordinary people which is why four million people voted for us last week".
He has had the guts to talk openly about immigration and it's only because of Nigel that now everyone is talking about this subject.
It's the first time for a 100 years that a smaller party has broken through to get 3.8 million votes to become the third largest party and this is due to Nigel's leadership. He has my full support.
Ukip's Patrick O'Flynn tells ITV News he still believes Nigel Farage is the best man to lead the party - but wants to see key advisers axed.Read the full story ›
Raheem Kassam, a senior adviser to Nigel Farage, is no longer working for Ukip, the party's leadership has confirmed.
A Ukip spokesperson said: "Raheem Kassam no longer works for UKIP. End of."
The move comes amid a row over the party's direction, with the election campaign chief Patrick O'Flynn criticising key figures around the Ukip leader - believed to include Kassam and party secretary Matthew Richardson.
Speaking about his departure, Mr Kassam said his contract with Ukip was always due to end at the end of May.
I was GE2015 staff. My contract has always expired at the end of the month and I am on holiday until then. Nigel is the best leader for UKIP
In other news, chill out guys. It's only a job, and one I enjoyed greatly.
Ukip party secretary Matthew Richardson, one of the aides reported to be the target of campaign chief Patrick O'Flynn's attack on Nigel Farage's inner circle, has reportedly offered to resign.
A Ukip source said: "I understand that he has offered his resignation".
Millionaire Ukip donor Stuart Wheeler has backed calls for Nigel Farage to stand down as leader.
He told BBC Radio 5 Live: "I would like him to step down, at least for the moment. And if he wants to put himself up in an election, then he has every right to do so,though I personally would prefer somebody else now."
The spread betting tycoon also said "the type of campaign that's now needed has to be slightly less aggressive and more towards winning over people in the centre".