Scott Morrison has refused to rule out being approached by disgraced former NSW Liberal MP Daryl Maguire over cash for visas.
The prime minister was on Thursday asked whether Mr Maguire made any representations to him or the government about the visa scheme.
Mr Morrison, who was immigration minister at the time, left the possibility wide open.
"It has been my long established practice back when I was minister and certainly as prime minister, you receive representations from many people in the community, from those opposite included on many matters, including on those which the member has referred to," he told parliament on Tuesday.
"It is my normal practice for those matters through my office to be referred to the relevant department or my department for an appropriate response, and that is the practice I have always followed."
The cash for visas scheme dates back to 2013 and has come to light during an ongoing NSW corruption inquiry.
Mr Maguire is accused of abusing his public office while serving as a state MP.
He once received thousands of dollars in cash to his taxpayer-funded office, with the money linked to securing Australian visas for Chinese nationals.
Mr Maguire has admitted making representations to immigration officials as well as federal politicians.
The scheme is being investigated by the Department of Home Affairs.
The department has advised the prime minister's office an initial search of its database did not uncover any correspondence between Mr Maguire and Mr Morrison in his former role as immigration minister.
"Additional searches conducted in the PMO indicate the prime minister has not received any such correspondence in his current role," a spokeswoman told AAP.
Australian Associated Press