Come clean on Hazzard ICAC claims: Baird

NSW Premier Mike Baird has demanded the opposition reveal the source of the material behind its attack on a senior government minister.

For the third straight day this week, Labor has used question time in state parliament to grill former attorney-general Brad Hazzard over his contact with a witness to the car accident which sparked ICAC's investigation into deputy crown prosecutor Margaret Cunneen.

Opposition Leader Luke Foley has accused Mr Hazzard of meddling in the corruption inquiry by directing the witness to Ms Cunneen.

Mr Baird on Thursday called on the opposition to substantiate the allegations.

"Will you confirm that no member of the Labor party and no member of the opposition has obtained this information illegally?" Mr Baird said.

It's been suggested Labor's allegations could have come from confidential material tabled at a parliamentary committee by ICAC Commissioner Megan Latham last week.

The government also confirmed on Thursday that the chair of the committee into the state's corruption watchdog was seeking advice on whether the material used in the attack on Mr Hazzard could have constituted contempt of Parliament.

Mr Foley needs to confirm where he got his information from, Mr Baird says.

"We certainly call on the opposition leader to answer those questions because it's a very serious issue that's been raised and he is attacking a minister," he told parliament.

Mr Foley refused to back down on Thursday.

"Let me be very clear. I have received no information from any member of the parliamentary committee on the ICAC," he said.

"If you want to make an allegation, have the guts to say it".

ICAC launched its ill-fated inquiry into Ms Cunneen last year amid allegations she advised her son's girlfriend to fake chest pains to avoid a breath test.

The investigation was shut down after the High Court ruled it fell outside the watchdog's jurisdiction.

Mr Hazzard has repeatedly denied any wrongdoing in the lead up to the controversial inquiry.

He also challenged Mr Foley to step outside the "coward's castle" of parliamentary privilege on Thursday and repeat his allegations.