Australia’s chief legal officer Attorney-General Christian Porter has revealed he is the man at the centre of a historical rape allegation involving a 16-year-old girl in Sydney in 1988, an allegation he emphatically denies.

After seven days of headlines over the shocking claims, Mr Porter today chose to relinquish his anonymity and categorically deny the allegations. Mr Porter has never been charged and police have confirmed that the matter is “closed”.

Mr Porter, 49, made the statement after consulting defamation lawyers.

The woman was an award-winning debater who met him when she represented South Australia on a state debating team as a teenager. In an unsworn statement she claimed the incident happened in 1988 after a night of drinking and dancing in Kings Cross.

At the time, she was 16 years old. Mr Porter was 17.

The claims were circulated last week in an anonymous dossier circulated to police and political leaders including Prime Minister Scott Morrison, former Prime Minister Malcolm Turnbull and Greens Senator Sarah Hanson-Young.

The woman who made the claim died in June 2020 after taking her own life in Adelaide, having approached police in 2019. Her family are believed to remain adamant they do not want her identified.

On Tuesday, NSW police confirmed they will not proceed with an investigation.

“NSW Police have since sought legal advice in relation to these matters,’’ a spokesman said.

“Based on information provided to NSW Police, there is insufficient admissible evidence to proceed.

“As such, NSW Police Force has determined the matter is now closed.”

The Prime Minister has previously revealed the Liberal minister at the centre of the allegation, who at that stage had not been identified, “vigorously” denies the allegations.

But former Prime Minister Malcolm Turnbull said on Tuesday that the minister must now “out himself” in respect for his colleagues and the country.

“He should out himself and he should provide a comprehensive statement,” he said.

“He should describe when he knew the woman, how he knew the woman, what dealings he had with the woman after the event. We need to know what he knew about the complaint and when he knew about it.

“Frankly, it’s not good enough for the Prime Minister to say ‘Oh, it’s a matter for police’. The Prime Minister cannot outsource his responsibility for composing his ministry to the police.

“He should require the minister to speak up. He owes it to his colleagues and the country.”

The NSW police investigation into the Adelaide woman’s claims was paused by her just days before her suicide.

However, SA Police are going through evidentiary material relating to her death to ensure all the documentation is sent to a coronial enquiry.

On Monday, Mr Morrison said he first heard about an anonymous letter to him detailing the claims last week and spoke to the minister and the AFP commissioner that same night.

The Prime Minister also revealed he had been “briefed” on the unsubstantiated rape allegations against the minister but that he had not read the document or the woman’s own words.

“Did I raise it? Yes, I did. And he vigorously and completely denied the allegations. So that means there is a proper process now for it to follow,’’ Mr Morrison said.

“It is the police, in a country where you’re governed by the rule of law, that determine the veracity of any allegations of this nature,’’ he said.

Asked if he believed the minister’s denials Mr Morrison said that was a matter for the police.

Lawyer Michael Bradley, who acted for the woman before her death, has called for an independent political inquiry into the matter.

“It’s a very unusual and unfortunate situation,” Mr Bradley said.