UKIP leader Henry Bolton has said the party's national executive committee (NEC) has no right to sit in judgement on his personal life.
And he warned that UKIP faced extinction if the NEC voted to get rid of him as leader when it meets later.
Mr Bolton has faced repeated calls to quit over offensive texts sent by his former girlfriend.
He told the BBC's
Pienaar's Politics the NEC was "not a court of moral judgement".
He said he had ended the "romantic element" of his relationship with Jo Marney after she sent texts saying Prince Harry's fiancee Meghan Markle would "taint" the Royal Family.