Multiple women have come forward complaining of now-former National MP Andrew Falloon sending them sexually explicit content, according to party leader Judith Collins.
Yesterday Mr Falloon announced he would be standing down at the election, before resigning from Parliament entirely today.
It was revealed that Mr Falloon had sent a pornographic image to a 19-year-old woman, who complained to police and the Prime Minister's office.
1 News understands there are now four women who have complained.
More women have come forward today, Ms Collins told media.
"There is a pattern of behaviour that now takes us out of an incident, a very unfortunate incident, into a pattern of behaviour," she says.
"We sought assurance from him - was there anything else he needed to tell us about? - and I was told no.
"I think that's very obvious he's lied to police and a lot of other people. Yes, I do believe that. I believe he's lied to a lot of people, probably including himself."
Ms Collins says she spoke to police about two more cases, and they indicated the investigation may be re-opened.
In a statement today police say they investigated a complaint about the "sending of an unsolicited image at the beginning of July".
They say the matter was investigated and didn't meet the evidentiary threshold for prosecution.
The statement goes on to say police, "have today been made aware of further allegations raised by the Leader of the National Party and we are now seeking more information in relation to these matters.
"Police encourages anyone with information to contact the 105 online or phone line (please quote reference 200703/9248), or contact Crimestoppers anonymously on 0800 555 111."