"Our position hasn't changed in respect of supporting the government and supporting legislation as we see fit," Dr McGirr said.

"We don't know any details about this situation apart from the fact that there is a police investigation. I'm not aware of any other information about it."

Dr McGirr's position since the Coalition fell into minority status has been to "maintain confidence of supply" in terms of supporting budget-related legislation in Parliament "unless there is serious mismanagement or corruption".

On Thursday, NSW Police released a statement that detectives from the Child Abuse and Sex Crimes squad had set up Strike Force Condello to look into "allegations of sexual violence-related offences" that had been made against a male NSW MP.

In other news

Later that day, Mr Ward identified himself as the MP who was under investigation and stepped down as Family and Community Services Minister.

"I have not been contacted by police in relation to any allegations," Mr Ward said.

"Until this matter is resolved, it is appropriate I stand aside from my role as Minister. I will also remove myself from the Liberal Party room."

On Friday, NSW Premier Gladys Berejiklian said she had spoken to Mr Ward and he had "denied any wrongdoing" and she was "shocked and distressed by what unfolded" on Thursday.

Mr Ward is the third MP and second Liberal to depart the Coalition ranks in the space of three months after Michael Johnsen quit Parliament over a rape allegation, which he has denied, and former sports minister John Sidoti left for the crossbench for the duration of a corruption hearing.

The departures have placed the Coalition into minority status, which will be further tested next weekend with the byelection to replace Mr Johnsen, a former Nationals member, in the Upper Hunter electorate.

Dr McGirr said the government had handled the situation around Mr Ward appropriately.

"I think both the Premier and the Minister have acted appropriately, as I believe they did with the previous situation [involving allegations against Mr Johnsen]," Dr McGirr said.

"They have acted to maintain confidence in the government. I think they acted quickly and appropriately, but I don't have any more information than is in the public realm."

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