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
Iran says it has successfully tested a new medium-range missile, bringing condemnation from Foreign Secretary Boris Johnson..
At least 305 people are now confirmed to have died in the huge tremor, while searches continue for survivors trapped in rubble.
The star said that "uncertainty" in the world had led him to take up a second European passport.