Wellington, June 9 NZPA - Police are yet to interview National Party list MP and former minister Richard Worth over a sexual complaint laid against him.

Dr Worth was asked to resign as a minister last week after it emerged that he was under police investigation over allegations of a sexual nature involving a Korean business woman.

Prime Minister John Key is also still trying to get to the bottom of an earlier allegation that Dr Worth harassed an Auckland Indian woman.

In a statement, which Mr Goff tabled in Parliament on her behalf, she said she received about 40 texts and 60 phone calls from Dr Worth.

Detective Inspector Paul Basham, head of Wellington CIB and in charge of the criminal investigation, today said although police had been in contact with Dr Worth he was yet to be interviewed.

The complaint was made in Auckland last month and inquiries were continuing in Auckland and Wellington, Mr Basham said in a statement.

Via his lawyer Dr Worth had assured police he would cooperate with their investigation.

It was too early to say when they were likely to interview Dr Worth as they work through inquiries.

"There remains a good deal of work left to complete," Mr Basham said.

Meanwhile, the tit-for-tat debate between Mr Key and Labour leader Phil Goff over what the opposition leader told the prime minister about the earlier allegation continued today.

Mr Goff rang Mr Key on May 6 to tell him that a female party member had come to him after getting offensive calls and texts from Dr Worth.

In his notes from the call he wrote that Mr Key had been aware of rumours before the election and that was why Dr Worth was not made speaker.

Mr Key said he did not say that.

Mr Key said the Labour leader had said he was calling to let him know about the behaviour but thought little could be done. Mr Goff said he didn't say that.

The two men also disputed the timing of the call. Mr Key said he didn't get off a plane until after 10pm. Mr Goff released Parliamentary Services phone records showing the call was placed at 9.49pm and lasted 8.5 minutes.

Mr Goff said Mr Key's memory had been proven faulty and called into doubt the accuracy of his recollection of the call.

"We are not getting into an argument about 10 minutes," a spokesman for Mr Key said in response.

"What we want to hear from Phil Goff is that the texts he's been talking about for a number of days are being provided to the Prime Minister's chief of staff."

Mr Key has refused to meet the woman until his chief of staff Wayne Eagleson can first see the texts she received.

She is now trying to get Vodafone to retrieve them.

She has alleged that between November and February, Dr Worth sent dozens of text messages, some sexually explicit, and called her numerous times.

She has also said Dr Worth offered her jobs in his ministerial capacity.

Dr Worth is on leave, but due to return for next week's caucus meeting.

Mr Key has said Dr Worth should consider his future as an MP and suggested he could be expelled from caucus.

If Dr Worth wanted to take more time to consider his position then it was likely he would be granted it.

Dr Worth issued a statement last Thursday saying he was innocent of any crime and would vigorously defend himself against any accusations that he had broken the law.