NSW premier 'disgusted' by explicit photo scandal

The NSW premier says he expects his party to act on an explicit photo scandal that has rocked his government and left him "disgusted".

Major damage was inflicted on the coalition government's already stuttering election campaign when Liberal MP Peter Poulos resigned from his parliamentary secretary role after apologising for emailing explicit images of a female rival five years ago.

The images, from a 1980s Penthouse shoot, were shared in the context of a preselection battle.

Premier Dominic Perrottet said when the situation occurred, he was "appalled, horrified and disgusted".

He said on Saturday that he expects the NSW Liberal Party to act, signalling Mr Poulos's future in the party could be in doubt.

The incident caused the female MP distress at the time, Mr Perrottet said.

"Peter has apologised, as he should have. There is no place for that behaviour in any workplace. I have made that very clear. 

"I expect the NSW Liberal Party to act appropriately as well."

The premier's sharpened language comes after he appeared to defend the upper-house MP earlier this week, saying Mr Poulos had offered a heartfelt apology over the incident.

"People make mistakes. No one is perfect. I've made a number of mistakes in life," Mr Perrottet said on Wednesday.

On Saturday, NSW Treasurer Matt Kean also said he was "very disappointed" in Mr Poulos, although he wouldn't speculate on the MP's future in the Liberal Party - which the deputy Liberal leader said was an internal matter.

"This is disrespect. I don't think there's any role for disrespect in workplaces or anywhere across our community," he said.

Labor leader Chris Minns said Mr Poulos's behaviour was appalling and would likely lead to instant dismissal in any workplace, not least the public service.

The government was caught in a second scandal on Friday when finance minister Damien Tudehope resigned from his portfolio after declaring he owned shares in toll road owner Transurban.

The company operates most of Sydney's toll roads and the city's tolling regime is one of several key election flashpoints.

The premier accepted Mr Tudehope's resignation, adding he had been cleared of wrongdoing by lawyers from the Department of Premier and Cabinet.

But Mr Perrottet refused to release that advice, saying he had already acted on the findings.

Mr Minns argued it should be made public as hiding the information from the public was "problematic".

Asked if the Liberal Party was in disarray six weeks out from the state election, the premier and treasurer insisted the party remained focused on delivering for families.

On Saturday, the coalition pledged $1.5 billion to set up a Clean Energy Superpower Fund to invest in renewables and boost the state's transition from fossil fuels.

The premier also announced a record $23 million funding boost for the state's life savers, for new rescue vehicles, jet skis and upgrades to their emergency communication devices.

Meanwhile, Labor pledged $13 million in the coming four years to deliver another 50 police officers to southwest Sydney to tackle escalating crime.