Transport Minister David Elliott says he has no regrets about issuing a warning to the premier which prompted him to apologise for wearing a Nazi uniform 20 years ago.
On January 12, Dominic Perrottet made the shock revelation he wore a Nazi uniform to his 21st birthday party in 2003 which was a uniform-themed fancy dress event.
Mr Perrottet said he decided to come clean about the "terrible mistake" after a phone call from a cabinet colleague, who he did not identify.
A government source later told the ABC that colleague was Mr Elliott.
Mr Elliott was on leave and today fronted the media for the first time since the premier's confession.
Speaking at the official launch for the new veterans' brain bank at Concord Hospital, Mr Elliott told journalists the photo scandal was the "last thing" on his mind.
"I'm not making any further comments on that," he said.
"The premier's answered all questions that need to be answered on that one."
He would not be drawn on whether he had seen a photo but said he had no regrets about making that call to the premier.
"Why would I regret that, warning my boss about something?"
No photos from the birthday party have emerged, and the premier says he is "not aware" of any images of him in the uniform.
Mr Perrottet's admission sparked questions over his leadership in the lead-up to the March state election but many of his senior ministers made public declarations of support for him.
Opposition Leader Chris Minns said he did not believe the premier should resign as his apology was "sincere".
Jewish leaders echoed this, saying Mr Perrottet had proved himself to be a friend of the community since the incident.
The Jewish Board of Deputies said it was a "lesson for all".
Mr Perrottet and Mr Elliott have shared a turbulent relationship in recent months, particularly over their conflicting views on gambling reform.
The premier has committed to rolling out a mandatory cashless gaming card in all clubs and pubs with pokie machines but Mr Elliott has warned against "demonising" one form of gambling over others.
He has told the media the Nationals were not sold on the proposal for a cashless card, something which was recommended by the NSW Crime Commission.
Mr Elliott has excluded himself from voting on gambling reforms as his son works in the industry for gaming giant Aristocrat.
Mr Perrottet said the fact the photo was first raised by a colleague did not suggest a divided party and he was confident in his position as leader.
"No, it's not about politics, it's about doing what's right," he said.
Mr Elliott is not contesting the March election, having announced his resignation last year after it became "clear" he did not have factional support to contest the new seat of Castle Hill.
His current seat of Baulkham Hills will be abolished at the March election.
