Ukip have selected East Midlands MEP Roger Helmer to run in the Newark by-election triggered by the recent resignation of Tory MP Patrick Mercer.
Mr Helmer, who defected from the Conservatives in 2012, has come under fire for remarks about homosexuality.
He has said that some people find same-sex relationships "distasteful, if not viscerally repugnant".
Ukip leader Nigel Farage also rebuked him for writing a blog that appeared to draw comparison between same-sex marriage and incest.
However Mr Helmer has insisted he is "liberal and tolerant" about homosexuality and has "no interest in telling consenting adults what they may or may not do".
More top news
International Great Britain triathlete Eleanor Penrose was taken to an A&E department twice in the space of 24 hours in August 2015.
Entertainer made a blind woman feel "completely and utterly trapped" when he assaulted her in hospital bedroom, a court has been told.
A Border patrol on the frontier that separates Texas from Mexico hopes Donald Trump will keep his vow to tackle illegal immigration.