ABC managing director David Anderson, Nine chief executive Hugh Marks and News Corp Australia chairman Michael Miller will speak together at the National Press Club in Canberra on Wednesday.

Their appearance comes after police raids on two media organisations earlier this month - over stories based on government leaks - sparked a debate on how free Australia's journalists are to go about their work.

The Canberra home of News Corp journalist Annika Smethurst was raided on June 4 over the 2018 publication of a leaked proposal to allow the Australian Signals Directorate to spy on Australians.

The following day, the ABC's Sydney headquarters were raided over stories published in 2017 alleging Australian soldiers may have carried out unlawful killings in Afghanistan, based on leaked Defence papers.

The ABC revealed on Monday it has launched legal action over the raid on its office and News Corp confirmed it plans to do the same.

The public broadcaster said it had lodged an application in the Federal Court to set aside the warrant that authorised the AFP raid on June 5 and to demand the return of seized files.

The ABC is also seeking a permanent injunction to prevent the AFP from accessing the material seized.

Mr Miller said News Corp would challenge the validity of the warrant used to raid Ms Smethurst's home because the news giant is "determined to fight for journalism and for the public's right to know".

Australian Associated Press