Holsworthy MP Melanie Gibbons said Premier Gladys Berejiklian has her "confidence and support" as disgraced former MP Daryl Maguire fronted the Independent Commission Against Corruption for the second day on Thursday.
ICAC is investigating whether Mr Maguire misused his public office in the pursuit of his own financial interests.
Ms Berejiklian admitted to the commission on Monday she had "a close personal relationship" with Mr Maguire, which continued after she sacked him in 2018.
Ms Gibbons told the Champion in a statement: "I believe that if she [Premier Berejiklian] knew of corrupt conduct she would have reported it straight away."
"Our Premier has my confidence and support because I know she is someone of the highest integrity and of solid values," she said.
"This is the same Premier that has steered our state tirelessly through bushfires, floods, drought and now COVID-19, with her strong work ethic and compassionate nature.
"She has always put the people of NSW first, and I'm sure will continue to do so."
Liverpool MP Paul Lynch voted for the censure motion against the Premier.
"I cannot see how she can remain as Premier. Granted the evidence revealed at ICAC and what was said to her, her position is untenable," he said.
"I'm entirely disinterested in her private life. What interest's me is the Premier's public duties and how she discharged them. She must go."