It's hoped an investigation will provide clarity into how ministries award contracts, and declare conflicts of interest.
The Public Service Commissioner has launched a probe into contracts awarded to family members of Nanaia Mahuta.
It was requested by Public Service Minister Chris Hipkins and Mahuta herself, after persistent media reports.
National MP Simeon Brown has been calling for an investigation.
He told Mike Hosking in three cases under the microscope, contracts were given to Mahuta's husband despite her being an associate minister for the department in question.
He says the reality is there are perceived conflicts, and taxpayers have high expectations of how these are treated.
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