Former NSW Premier Gladys Berejiklian won't run in federal election

Former New South Wales Premier Gladys Berejiklian has confirmed she won't be running in next year's federal election.

Ms Berejiklian, who resigned as Premier and left Parliament in October after it was revealed she was under investigation by ICAC, had been touted as a potential candidate for the seat of Warringah.

But speaking to Ben Fordham on 2GB, Ms Berejiklian said it was not part of her plans.

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"I won't be contesting the seat of Warringah, or any other federal seat for that matter," she said.

"My time in public life comes to an end on December 30."

That will be Ms Berejiklian's last day as an MP.

The former premier did not confirm if she had already locked in a new job, and said she was looking forward to taking a break and spending time with her friends and family.

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Ms Berejiklian's decision will come as a blow to the government, after Prime Minister Scott Morrison and former prime ministers Tony Abbott and John Howard all backed her as a candidate for Warringah.

The northern Sydney seat was a blue-ribbon Liberal stronghold until the 2019 federal election, when Independent Zali Steggall won the seat from Mr Abbott, who had held it since 1994.

Ms Berejiklian, who represented the state seat of Willoughby from 2003, became Premier of NSW after predecessor Mike Baird stepped down in 2017.

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Mr Morrison said he wished Ms Berejiklian "all the best" after she confirmed she would not be running for the federal seat of Warringah next year. 

The Prime Minister had previously said she would be an outstanding candidate for the seat. 

"She's made a decision to go forward into a new chapter of her life, and Jenny and I wish her all the best in that," Mr Morrison said. 

"We've got great female candidates in particular who are coming to stand in our team." 

Mr Morrison said Ms Berejiklian had been a "trailblazer" for women in the Liberal party.

The ongoing ICAC investigation into whether she breached public trust during her time in Parliament has become a recent focus for an under-pressure government, with Mr Morrison labelling it a "kangaroo court" and saying Ms Berejiklian had been treated "shamefully".

The Coalition government is facing ongoing calls to commit to a federal anti-corruption body.

Ms Berejiklian has denied any wrongdoing.