Mark Latham is still the right man to lead One Nation in Parliament despite his attacks on gay men, according to one of his party colleagues.

Rod Roberts, who sits in the upper house with Mr Latham, said his leader was entitled to express opinions and no one was forced to agree with him. 

That was despite federal party leader  slamming some of Mr Latham's comments as disgusting. 

'I have no problems with his leadership,' Mr Roberts told Daily Mail Australia. 'He's entitled to his opinion and it is his opinion. We do live in a free society. 

'Now, you don't have to agree with what he says but like everybody else he is entitled to express an opinion.'

NSW Police confirmed on Monday an investigation had been launched into a crude tweet Mr Latham directed at gay independent MP Alex Greenwich.  

Mark Latham is still the right man to lead One Nation in New South Wales Parliament despite his attacks on gay men, according to one of his party colleagues.

Mr Latham is pictured with One Nation federal leader Pauline Hanson

Last week Mr Latham said said the thought of two men having sex was so 'disgusting' to a straight male it made him want to 'vomit'.

'The basic natural reality is that we don't go for anal sex with blokes and it's pukeworthy,' he told a radio audience on April 27.

Mr Latham had revealed more of his views on homosexual acts when asked to explain a vulgar tweet he posted in March about Mr Greenwich. 

Mr Greenwich had called Mr Latham a 'disgusting human being' for giving a speech at St Michaels Church at Belfield in south-west Sydney on March 21 while Christians clashed outside with LGBTQI activists.

'Disgusting?' Mr Latham responded on Twitter.

'How does that compare with sticking your d*** up a bloke's a*** and covering it with s***?'

Mr Latham, who has refused to apologise for the tweet, appeared on Chris Smith's program last Thursday and went even further.

'I speak for a lot of straight men, Chris, in saying that the idea of having anal sex with another man would make you vomit,' he said. 'That's what makes us straight.

'Now, I know there's no category or letter in the LGBT ABC WTF alphabet for straight men but that's how we honestly feel about people like Greenwich.'

Mr Latham had revealed more of his views on homosexual acts when asked to explain a vulgar tweet he posted in March about about gay independent MP Alex Greenwich (above)