Controversial West Australian treasurer Troy Buswell has been accused of abusing his power by intervening to get his son an appointment for a driving test.
It emerged on Monday that Mr Buswell, who is also the state's transport minister, had tasked his office to ring the WA Department of Transport to arrange a driving test for his son.
They succeeded in getting an appointment last month, on a day when no regular driving tests were scheduled in his hometown of Busselton, according to the public sector union.
Opposition transport spokesman Ken Travers said Mr Buswell's actions were a breach of the Ministerial Code of Conduct and he should be sacked.
"Mr Buswell has faced repeated warnings for repeated transgressions and this should be the last straw," Mr Travers said.
"It is a clear abuse of ministerial power to get your own department to make sure a family member avoids the queue.
"There is no question that this is misuse and abuse of a minister's position."
Mr Buswell hit back, saying the public was quite within its rights to do the same as him, and ask his office to contact the department.
"My staff, my office made an enquiry, or a request of the Department of Transport," Mr Buswell said.
"Is that unusual? No. Can the public do that? Yes, yes they can."
And he was defended by Premier Colin Barnett, who said Mr Buswell was a father as well as a minister.
But Community and Public Sector Union branch secretary Toni Walkington said Department of Transport staff were angered by the revelation.
"They are annoyed this type of thing could happen when they are struggling to keep up with the workload because of budget cutbacks and public sector staff freezes," Ms Walkington said.