Fresh evidence indicates Peter Dutton did not make a third intervention to save an au pair from deportation, calling into question former Border Force commissioner Roman Quaedvlieg's explosive claims about the Home Affairs Minister's personal connection to one of the cases.

But Labor has quickly disparaged the new information, provided by the Department of Home Affairs to the Senate inquiry into Mr Dutton's au pair saga, observing the minister has made at least six other visa interventions that his department did not include in its evidence.

The details of the interventions have come as Mr Quaedvlieg's complaint about Mr Dutton's extraordinary question time attack – in which he accused the former official of "grooming" a younger woman – was referred to Parliament's privileges committee. The committee is chaired by Liberal MP Ross Vasta, who is himself linked to claims about Mr Dutton helping two former Queensland police colleagues get jobs in Mr Quaedvlieg's Border Force.

Home Affairs Minister Peter Dutton. Credit:Alex Ellinghausen

In a dramatic escalation of the fracas, Mr Dutton on Tuesday used the legal cover of parliamentary privilege to attack Mr Quaedvlieg over his relationship with a woman 30 years his junior who he helped get a job within Border Force, and which ultimately led to his dismissal. Mr Dutton said Mr Quaedvlieg, who had accused the former minister of personal links to a possible third au pair case, was "discredited and disgraced".