A Republican party leader has received a racist death threat in the wake of an interview where he claimed Bill Clinton has an 'illegitimate son'.

Utah Republican Party Chairman James Evans was threatened in a voicemail received at the party's office in Salt Lake City.

'You might want to tell that lying n***** James Evans that he's lucky he's not being lynched right now,' the voicemail said, the Salt Lake Tribune reports.

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Utah Republican Party Chairman James Evans has received a racist death threat in the wake of an interview where he claimed Bill Clinton has an 'illegitimate son'

The newspaper also claims the phone number used to make the call was traced back to a nearby business, but the owner claimed he did not know anything about it.

The man who denied the call reportedly posted a number of anti-Trump messages on social media, including one where he said he was looking forward to when someone 'assassinated' the Republican nominee.

'@realDonaldTrump can't wait for your assassination! Millions of Americans will dance with joy that your mouth is finally shut the f*** up!' one tweet read.

'@realDonaldTrump I will dance the day you are assassinated by a Muslim! Keep talking a**hole. Thank God you will soon be dead,' another read.

The Utah party chairman played a video of the voicemail that was left at one of the Republican offices (pictured) in Salt Lake City

The message left about Evans (pictured with Donald Trump) said: 'You might want to tell that lying n***** James Evans that he's lucky he's not being lynched right now'

The death threat was made after Evans appeared on CNN last week, bringing his interview to an abrupt end when he mentioned Clinton's alleged love-child.

'I want to make this one last point if I could, I'm looking forward to the interview you're going to have with Bill Clinton's illegitimate son and ask Hillary Clinton if she is willing to accept him,' he said to host Carol Costello.

Costello then cut Evans off, saying: 'No, no, no, no. Come on, oh please. That's just rubbish, he does not have an illegitimate son. Why would you bring that up.'

The Salt Lake Tribune claims the phone number used to leave the message was linked to the person who posted these messages on Twitter

Fox 13 in Salt Lake City reports the threats have been felt by both parties, with the Democrats having to ramp up their safety methods.

'We’ve reinstalled a security system,' Executive Director for the Utah Democratic Party Lauren Littlefield said.

Littefield told the station the party office had also received threatening voicemails - as well as letters and postcards.

'The last message he left on my voicemail was that conservatives are going to win the war and if you have to die so be it,' she said.