1:30pm - Southland District Mayor Gary Tong is in China as a guest of the millionaire Chinese businessman Zhang Yikun, who allegedly donated $100,000 to Simon Bridges' campaign.

Mr Yikun was awarded the New Zealand Order of Merit in September for his services to New Zealand-China relations.

1pm - Jami-Lee Ross has arrived to hand in evidence to Wellington police that he says will prove his allegations of corruption against Simon Bridges.

It's understood he will release the recordings to media this afternoon.

"I have proof that we discussed a $100,000 donation on the phone," Mr Ross told press in Wellington on Wednesday afternoon.

"I have a recording that we discussed $100,000, and that was a donation that Simon Bridges was offered by Zhang Yikun."

"[Mr Bridges] called me excited by the donation and asked that I collect it, and subsequently I had the presence of mind, knowing what I was being asked to do, to record the phone conversation. That's the evidence that I have."

"I was asked to do some things with that donation which I want to talk to the police about. On the phone, it was very explicit that he wanted me to ensure that it wasn't made public."

Mr Ross told press on Tuesday that he allegedly accepted a request from Mr Bridges to break up a $100,000 donation into smaller pieces, below the legal threshold for named disclosure.

12:30pm - National deputy leader Paula Bennett has suggested the party may bring in auditors to investigate an alleged unlawful donation to Simon Bridges' campaign.

But Ms Bennett told Stuff Jami-Lee Ross might be held accountable for any illegal activity - not Simon Bridges. "We need to see the detail of what he is talking about," she said.

12pm - The identity of the person who donated $10,000 to 'Cathedral Club' has come forward to reveal himself as Auckland millionaire and investor Aaron Bhatnagar.

He took to Facebook to note that the Cathedral Club was an "informal pay-your-own-way dinner club that started in 2001," comprised of a "small group" of National supporters.

The group met in the Cathedral Room of the old Auckland Club, he said, where "interesting guests across the political divide" attended. Among the guests Mr Bhatnagar listed were Winston Peters, Rodney Hide and Michelle Boag.