A senior Ukip party source has urged its leader Nigel Farage to "take a break" amid after internal tensions about the way the party is run.
The source also claimed that the party had not behaved in a "grown up" way since the general election, when Mr Farage tendered his resignation only to be reinstated as leader.
The latest attack on Mr Farage came after campaign chief Patrick O'Flynn claimed he had become a "snarling, thin-skinned, aggressive" man who is turning the party into a "personality cult".
The source backed Mr O'Flynn's comments and added: "At this stage of the electoral cycle most parties would naturally have a period of reflection and a democratic discussion about the way forward".
Former Ukip MEP Godfrey Bloom has said the time has come for Nigel Farage to step down as party leader.
Mr Bloom, who worked with Mr Farage for many years before he left the party after a series of controversies, said he is not a "team-player".
Mr Bloom told BBC News: "He has taken the party forward very, very well indeed, but he is clearly now an extremely tired and stressed man. Time for him to move over, one might think.
"One of the problems that Ukip has had for several years is that any constructive criticism of the policy or the leadership has got you sacked.
"You are out of the door at the speed of light. Any criticism of Nigel isseen as disloyalty to the cause".
Derogatory comments made by Ukip's campaign chief about Nigel Farage were aimed at his team rather than the party's leader himself, an ally of Mr Farage has said.
Patrick O'Flynn described Mr Farage as a "snarling" man and said that the party looks like a "absolutist monarchy or a personality cult".
"The only thing I would point out is this is not about Nigel's leadership," the source said. "It's not about his personality, it's more about the team around him."
Asked whether there would be changes in Mr Farage's inner circle following the broadside from Mr O'Flynn, the source said: "I don't know. It's still to be sorted out."
Ukip's Patrick O'Flynn has launched a stunning attack on Nigel Farage, describing his party leader as a "snarling, thin-skinned, aggressive" man.
In an interview with The Times (£), Mr O'Flynn, the party's campaign chief and economics spokesman, accused Mr Farage of turning Ukip into a "personality cult".
He said Mr Farage is no longer the "cheerful, ebullient, cheeky, daring" politician of recent times and claimed that his behaviour risked the party being seen as an "absolute monarchy".
What’s happened since Thursday night, Friday morning has certainly laid us open to the charge that this looks like an absolutist monarchy or a personality cult.
I don’t think that even Nigel would say it’s been the most glorious chapter of his leadership.
He blamed Mr Farage's "aggressive" and "inexperienced" advisers and called for a "much more consultative and consensual leadership style".
Mr O'Flynn's comments come after Mr Farage was widely mocked for resigning as leader after failing to win the South Thanet seat he stood for in the General Election, only to be reinstated three days later after the party's National Executive Committee rejected his resignation.
Police are looking into an allegation of electoral fraud in Thanet South, the seat which Ukip leader Nigel Farage failed to win at the general election.
Mr Farage lost to the Conservatives' Craig Mackinlay who won 18,838 votes to Mr Farage's 16,026.
A Kent Police spokesman said: "Kent Police has received a report of electoral fraud. Inquiries are ongoing."
Farage quit as Ukip leader after the result, but his resignation was rejected by the party and he remains as leader.
Ukip's National Executive Committee has denied coming under pressure from Nigel Farage to reject his own resignation and said the body was "100% behind" the leader.
It comes after reports suggested Farage was in the room for deliberations about the party leadership.
Chairman Steve Crowther said: "There was not the slightest suggestion that the NEC was anything other than unanimous in its wish for Nigel to withdraw his resignation.
"He spent a considerable time making the case for his resignation, and the appointment of an interim leader, but there was no-one in the committee who did not want him to stay on.
"He left the room while it was further discussed. I took the views of members and they unanimously asked him to remain as leader. The NEC is 100% behind Nigel as we go forward in to the referendum campaign which is already under way."
Nigel Farage has denied that Ukip is a "one-man band" after his surprise return as leader - just three days after resigning.Read the full story ›
Ukip's Nigel Farage has revealed he felt he "owed it" to the party to stay on as leader when the national executive committee rejected his resignation.
In a first-person piece written forThe Telegraph, he said he felt there were "huge battles about to take place", adding that he had to put the country's interests first and foremost - as well as honour the wishes of the party's members.
Ukip will focus on electorial reform, he said, highlighting the four million votes they won - returning just one MP to Parliament - compared to the 56 SNP MPs elected on just 1.4 million votes between them.
And the major issue on the horizon, he added, was the promised referendum on Britain's membership of the EU.
As much as I wanted to spend the summer fishing, walking, and of course, in the European Parliament where all hell is currently breaking loose – that I owed it to the party that got me here.
There are some huge battles about to take place, and as much as I had thought that taking at least the summer off was in my best interests, I realise now that the party comes before me, and indeed, that this country comes before both.
With a European Referendum potentially on the horizon, I feel the need to stay involved for just a little bit longer, to add my voice to those who want Britain to be a country that trades and deals with the world, rather than ties itself to a post-WWII mind set about Europe and the political union.
Have I done the right thing by my party and my country? I think so. And I’m sure many people will have their opinions on the matter. All I can say is that I’m ready for the challenges ahead.
The fight starts here.
Senior Ukip members have welcomed Nigel Farage's decision to stay on as party leader, after the national executive committee rejected his resignation.
Deputy chairman of the party, Suzanne Evans, had been tipped to stand in until a leadership contest in the autumn - but she took to Twitter to assure followers she was among those who helped persuade Mr Farage to stay.
Very pleased @nigel_farage still at the helm. As stated previously, I tried to persuade him to stay and was never actually appointed leader!
It comes after a statement by party chairman Steve Crowther was released, explaining that the committee had rejected the resignation on the basis that Ukip members did not want Mr Farage to leave and labelling the election campaign a "great success".