Henry Bolton, who was elected in September, has refused to quit despite a vote of no confidence by UKIP's ruling committee, and party members will now decide his fate.
Under the former leadership of Nigel Farage, the anti-immigration party was instrumental in the 2016 vote for Brexit, but has since been dogged by in-fighting, financial woes and falling public support.
Bolton, a former army officer, is the third elected leader since Farage stepped down and has vowed major reform of the party.
"I understand the scrutiny and public interest but its been going on for six weeks. There's probably been nothing like that since the Profumo affair or Diana and Dodi," he told Sky News television.
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Bolton has ended the relationship but a string of senior UKIP politicians resigned over his leadership, warning the situation had become "almost farcical".
At an extraordinary general meeting in the central English city of Birmingham on Saturday, UKIP members will decide whether to endorse last months no confidence vote by UKIP's national executive committee.
If they support the move, UKIP will face another leadership election - and Bolton has not ruled out standing again.
It has also been dogged by financial problems, and this week a court ruled the party was liable for some costs in a defamation case against one of its members of the European Parliament.
Bolton has previously warned that UKIP cannot afford a new leadership contest, whether financially or politically.
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