NSW Premier Gladys Berejiklian resigned as NSW Premier on Friday, while Deputy Premier and NSW Nationals Leader John Barilaro announced he too would be resigning on Monday morning.

Ms Berejiklian's resignation came shortly after it was officially announced she was being investigated by the Independent Commission Against Corruption (ICAC).

ICAC said in a statement it was investigating whether Ms Berejiklian engaged in conduct that "involved a breach of public trust" during her secret relationship with former Wagga MP Daryl Maguire.

Meanwhile, Mr Barilaro said he had been thinking for some time about resigning and was looking for a career change, saying there was no better time than now to do so.

Federal Member for Farrer Sussan Ley commented on the premier's decision to stand down.

"Every day she (Gladys Berejiklian) got up and went to work for the people of NSW, giving it everything - I really don't think I have ever met a more conscientious politician," Ms Ley said.

"Gladys will rightly be remembered for her real reforms of service delivery in NSW.

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"Perhaps this was born from her own life and path into politics which gave her a real appreciation for those who are doing it tough - whenever I met her, it was this compassion which shone through."

Meanwhile, Griffith City Council Mayor John Dal Broi said that it was 'quite a big shock' for both the Premier and Deputy Premier to step down so suddenly.

"Both in my opinion have been very good to and supportive of regional NSW," Councillor Dal Broi said.

"Especially John Barilaro who as Minister for Regional Development sent plenty of funds into the regions, more so than ever before in my time in local government.

"We certainly will continue to work alongside the new leader of the National Party and our new Premier Dominic Perrottet."

On Monday morning, Member for Murray Helen Dalton said Mr Barilaro's resignation was a "good thing" for NSW.

"Mr Barilaro was never really focused on his job, he seemed too busy suing YouTube comedians," she said.

"He set up a new Department of Regional NSW and put the head office in The Rocks, Sydney. That shows his lack of commitment to regional areas.

"I wrote to him on important issues like black spots, water corruption, vaccinations and the like and he often wouldn't bother to respond.

"The NSW government could be plunged into minority status, that's good news for towns like Leeton and Griffith - because they'll need my vote in Parliament to pass legislation."

"When they have a majority, they can just ignore us here in the bush.

"But now I'll have more bargaining power to secure funding for Leeton hospital and to address black spots and fix country roads."

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