Investigative journalist Nicky Hager is "considering his options" after it was revealed Westpac provided police with his private banking records.
In a statement today, Hager's lawyer Felix Geiringer said it's difficult for his client to comment, because the matter is part of an ongoing case that's still to go before the courts.
While he knew about the "privacy breach" from documents released to him through the legal discovery process, Hager was prevented from taking any action because they had not yet been relied upon in open court.
Mr Geiringer said despite requests under the Official Information Act and the Privacy Act, police have so far been unwilling to release documents relating to the release of information by Westpac, or acknowledge the existence of any correspondence with the bank.
"Mr Hager has complained to the Privacy Commission and the Office of the Ombudsman about the police failure to respond fully to his requests for documents," Mr Geiringer said.
"Now that the fact of this breach of privacy has been made public, Mr Hager intends to seek a full and frank disclosure of the extent of the breach from Westpac.
"He looks forward to receiving Westpac's response to that request and will be considering his options to take this matter further."
Meanwhile, Hager is still waiting on a decision from the High Court after he was granted a judicial review of the 10-hour police raid on his Wellington home in October 2014.
It took place in the aftermath of the release of Hager's book, Dirty Politics, which was based on information taken from Whale Oil blogger Cameron Slater's emails and online communications.
The information was given to Hager by an anonymous hacker and the search was part of the ongoing police investigation to identify that person.
Hager sought a judicial review of the way police applied for a search warrant, the subsequent granting of the application, and the way the search was carried out.