He said Quaedvlieg was “someone the Labor Party should not rely on”, calling him “your Godwin Grech”.
A Senate committee is inquiring into Dutton's use of his ministerial discretion over visas. He overrode advice from officials when he granted visas to two au pairs who had been detained.
Roman Quaedvlieg was sacked on Thursday by the governor-general on the recommendation of the government.
The government has been extraordinarily secretive when questioned in recent months about where the investigation was up to and why it was so prolonged.
Politics Podcast: Peter Dutton on balancing interests in Home Affairs.
Peter Dutton says there is no basis to concerns about the excess power of the home affairs department.