The weekend’s disclosure that an allied foreign government monitored a U.S. law firm’s communications with a client has already been cited in a legal challenge to the National Security Agency’s surveillance practices.

The New York Times reported on Saturday that the Australian Signals Directorate, the NSA’s counterpart, had informed the agency that it was monitoring communications between Indonesian government officials and their counsel at the law firm in question. The newspaper cited a top-secret document released by former NSA contractor Edward Snowden.