Interior Minister Peter Dutton used parliamentary privilege on Tuesday to respond to claims that he helped secure jobs for two former police colleagues.
"This defamation comes from the former commissioner of the Australian Border Force, a man who was commissioned fired from his post, was a man who groomed a girl 30 years younger than him," Dutton told parliament on Tuesday under parliamentary privilege.
"He is discredited and disgraced."
In a statement issued on Tuesday afternoon, Quaedvlieg said Dutton's comments were "disgusting and offensive."
He defended his decision to send a statement to the parliamentary inquiry into Mr. Dutton's actions as minister.
"It is an extraordinary behavior of a cabinet minister to preventively prevent the character and reputation of a witness," he said.
"I ask you to formally withdraw that comment."
The workers used Question Time to launch a sustained assault on Mr. Dutton with respect to the claims.
The Minister responded by bringing thick and conspicuous folders with the names of Labor MPs Chris Bowen and Tony Burke highlighted.
Mr. Bowen had only written 192 times about visa issues, Dutton told parliament.
"You've been there with your wet lettuce talking to reporters, you've been issuing angry press releases, and after all that time, that's the best thing you can think of," Dutton said.
"They can follow everything they want, I'll tell you so much, all I'll do is duplicate."
Shortly after question time, Roman Quaedvlieg tweeted incredulously about the minister's "rambling" comments.
Previously, the Senate committee investigating Peter Dutton's use of ministerial powers to avoid au pairs of deportation asked for more time to publish his final report.
SBS News understands that Labor Party President Louise Pratt will request Senate approval to extend the investigation until September 19.
The Upper House will have to approve the extension, but the Labor Party trusts that it will pass with the support of the Greens and the central bank.
The senators in the investigation have already received e-mail leaks from the internal affairs department.
The investigation was due on Tuesday, but recent revelations by former Border Force chief Roman Quaedvlieg have raised new questions and sparked a bitter public dispute with Mr. Dutton.
Mr. Quaedvlieg wrote to the investigation alleging that the minister's chief of staff had asked him to help a "fellow" of Mr. Dutton by avoiding the deportation of a young European au pair, who had been detained by the Border Force under Suspect of visa violation.
Mr. Dutton responded by accusing his former senior border officer of working with the Labor Party in a smear campaign and pointing out that Mr. Quaedvlieg's dates did not coincide with the dates he worked in the department.
In turn, Mr. Quaedvlieg wrote a second letter explaining the confusion of the date suggesting that he may have been referring to a third au pair intervention.
Labor Senator Murray Watt said there was a "growing scandal around Peter Dutton."
On Monday, Dutton distanced himself from the Queensland cop at the scandal center by one of the au pairs.
The dispute is reduced to whether Mr. Dutton did a friend a favor, or if he was simply judging the case on its merits after he was contacted by a man who had not spoken in 20 years.
"You do not have my personal phone number or my personal email address."
The minister has also published the email he received from the contact, which began with the words: "Peter, long-standing between calls".
The workers took advantage of the email as proof of a certain familiarity between the two men.