The Australian Workers Union's (AWU) legal representatives have informed the Federal Court that the union will seek to subpoena Cash, as well as her former media adviser David de Garis and former Fair Work Ombudsman (FWO) official Mark Lee.



The subpoena applications will be formally made in the next day and if successful, all three will be required to appear in court at the end of the month to give evidence and face cross-examination about their knowledge of the leaks and subsequent raids.

“We believe the raid and the investigation itself to be unlawful," AWU national secretary Daniel Walton told BuzzFeed News. "That is why the AWU has gone to the Federal Court.

“We think the testimony of [Cash, de Garis and Lee] is important to understanding exactly what happened.”

The AWU launched its Federal Court challenge following revelations from BuzzFeed News that Cash's office tipped off the media about the October 24 raids by the Australian Federal Police (AFP) on the union's Sydney and Melbourne offices.