National Party leader Judith Collins is refusing to confirm or deny having told MP Nick Smith of an imminent media story into his alleged bullying in the workplace, which he has cited as a reason for resigning.

Smith on Monday said he would leave Parliament on June 10, revealing Parliamentary Service was investigating "a verbal altercation in my Wellington office last July that has not concluded".

It is understood the altercation involving Smith was with a young staff member who had worked there for less than a year prior to the incident.

Smith further divulged he was told on Friday the inquiry and its details had been leaked to media for release on Tuesday. No further details have been reported since.

A Politik article claimed that Collins had told Smith on Friday that a media story would be published on Tuesday in relation to the complaint - which Collins has refused to confirm or deny.

"Any discussions that I had with Nick Smith, other than what I've already said, are entirely between Nick and me and I will not go down that track," she told RNZ this morning.

National's woes continued today, as 2020 candidate Jake Bezzant has parted ways with the political party following explosive claims that he impersonated his ex-partner online, shared explicit photos and even pretended to be her during cyber sex.

Bezzant's former partner, Tarryn Flintoft, has gone public with the claims in an hour-long podcast shared online this week.

Bezzant, who unsuccessfully ran for the Upper Harbour seat last election, told the Herald there is no truth to the accusations.

Listen above as Trish Sherson and Hayden Munro discuss the day's news with Heather du Plessis-Allan on The Huddle