Health Minister Sussan Ley is under increasing pressure to explain her use of taxpayer-funded travel entitlements while buying a Gold Coast apartment.
Ms Ley bought the $795,000 apartment in May 2015 from a Liberal National Party donor she had previously met.
The minister insists she was required to be in Queensland that day for a $1.3 billion medicines announcement at Brisbane's Wesley Hospital, before travelling to the Gold Coast to meet with patients.
"The property purchase was not planned or anticipated," she said in a statement on Friday.
Ms Ley said her husband accompanied her under family travel arrangements and all travel undertaken was in accordance with the rules.
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Labor is calling for Ms Ley's resignation, insisting her claim the apartment was an impulse purchase doesn't pass the pub test.
Opposition health spokeswoman Catherine King said ministerial standards require diligence and the "non-blurring" of public and private lives, calling on Ms Ley to release her diary and details of who she met on the trip.
Ms Ley bought the home from Martin Henry Corkery, who donated $50,000 to the Queensland LNP in 2011.
Mr Corkery said he was living in Europe at the time his Main Beach Parade apartment was sold at auction and only found out Ms Ley had purchased it when he received the contract.
Deputy Prime Minister Barnaby Joyce has defended Ms Ley, arguing she went to Queensland on legitimate ministerial business.
