New South Wales crown prosecutor Margaret Cunneen SC has been picked by the Federal Government to join its expert panel advising on the development of a national anti-corruption commission.

Key points: Government announces expert panel to advise on development of national anti-corruption commission

Government announces expert panel to advise on development of national anti-corruption commission NSW Deputy Senior Crown Prosecutor Margaret Cunneen SC among three experts appointed

NSW Deputy Senior Crown Prosecutor Margaret Cunneen SC among three experts appointed Cunneen was subject to controversial investigation by the NSW anti-corruption commission in 2014

Ms Cunneen has been a fierce critic of the New South Wales Independent Commission Against Corruption (ICAC), arguing for sweeping changes to the state body's powers and processes after she was subject to a controversial investigation by the commission.

The investigation was launched after allegations she had coached her son's girlfriend to fake chest pains in order to avoid a breath test after a car accident.

She took the organisation to the High Court, arguing it did not have the power to investigate her.

In 2015, the ICAC inspector said it was "unreasonable" for ICAC to have launched the investigation, describing it as a "low point" for the organisation.

A parliamentary inquiry into the incident was launched the following year, and no charges were laid.

Attorney-General Christian Porter has announced Ms Cunneen as one of three experts to advise the Government on the development of its Commonwealth Integrity Commission (CIC), after she retires as Deputy Senior Crown Prosecutor in New South Wales.

She will join former Australian Federal Police Commissioner Mick Keelty and long-time West Australian public servant Mal Wauchope on the panel.

"The unique experiences of these three individuals across criminal law and prosecution, public sector administration and law enforcement will assist the Government to ensure that the model for the CIC is effective, appropriate and balanced," Mr Porter said in a statement.

Prime Minister Scott Morrison announced the Coalition would establish a national integrity commission last week, arguing he wanted to avoid the show trials seen in ICAC hearings in states such as New South Wales.

Senior lawyers were quick to criticise the proposal, arguing it lacked transparency and had "no teeth".

The Government has opened public consultation on the CIC proposal until the beginning of February.