'Come clean on Ashby', Shorten tells Pyne

Opposition Leader Bill Shorten has called on two Turnbull government ministers to come clean over their role in the Ashby-Slipper affair.

It comes as the Australian Federal Police confirmed Christopher Pyne and Wyatt Roy were "assisting police with inquiries".

Mr Shorten told reporters in Melbourne it was "long overdue" that both ministers come clean over their involvement in the procurement of former Speaker Peter Slipper's diary.

The AFP is investigating allegations of an "unauthorised disclosure" of Mr Slipper's commonwealth diary.

It has executed a search warrant at the Queensland home of Mal Brough, who was forced to step down as special minister of state in December while the investigations continue.

The search warrant said police were investigating whether Mr Brough "counselled and procured" Mr Slipper's former staffer James Ashby to disclose extracts from the diary and provide those extracts to third parties without authority.

Mr Ashby says it was Mr Roy who told him to make a copy of the diary, after speaking to Mr Pyne.

The AFP, in a statement on Monday, said it had spoken to Mr Ashby and understood he was seeking legal advice.