Australian Home Affairs Minister Peter Dutton (AAP Image/Lukas Coch)
Federal police have raided the Department of Home Affairs office in Canberra, as officers investigate a leak related to the au pair saga.
Internal emails leaked to the media showed minister Peter Dutton's office demanded an au pair detained at Brisbane airport be given urgent consideration for a visa, preferably within an hour.
Mr Dutton told parliament last month he did not know the people she was planning to work for.
It was later revealed her intended employer was an old Queensland Police colleague of Mr Dutton's, Russell Keag, who emailed the minister's office to say it had been a "long time between calls".
Mr Dutton said he had not spoken to Mr Keag in 20 years before he was approached for help with the visa.
The emails also show the department expressly disagreed with Mr Dutton's push to give a visa to another au pair detained in Adelaide in November 2015.
He intervened after AFL boss Gillon McLachlan got his office to contact Mr Dutton's office to ask for help.
Asked about Thursday's raids, an AFP spokesman told AAP it had received the Home Affairs leak referral on August 30.
"The matter has been accepted for investigation," the spokesman said.
"The AFP has undertaken enquiries and conducted a number of activities in relation to this investigation."
Nine News reported the AFP had agreed to hand over seized documents to the Clerk of the Senate, after a request from Labor.
Labor justice spokeswoman Clare O'Neil said Mr Dutton himself had serious questions to answer over the au pair issue and should not be pursuing whistleblowers.
"He told us that he didn't have any connection with the two families for whom he gave an au pair arrangement and we know that that ultimately wasn't the case," she said.
"What I don't want to see here is ... the Home Affairs Minister taking action against people who are divulging information that's probably in the public interest, when it's him that has a case to answer."
Liberal MP Michael Sukkar said the leak inquiry was important.
"Whether it is a Liberal government or a Labor government, they need to have confidence that public servants are treating information appropriately and it is very important that if there are breaches of those rules that they are followed up," Mr Sukkar told Sky News.
Former Australian Border Force chief Roman Quaedvlieg questioned the ad hoc basis of such investigations.
"Over the course of the government's long investigation into allegations against me, I have referred multiple leaks to the AFP ... (and) I've no current advice on their acceptance, status or progress," he tweeted.
© AAP 2018