The Fiji Law Society has filed a legal challenge to the appointment of Justice Anthony Gates as acting chief justice.
Fiji TV reports that the legal papers were filed with the Suva High Court registry this week.
The Judicial and Legal Services Commission comprising senior judge Justice Nazhat Shameem, the public service commission chairman Rishi Ram and the Fiji Law Society president, Davnesh Sharma, appointed Justice Gates as acting chief justice.
It happened after President Iloilo suspended the substantive chief justice, Daniel Fatiaki, over allegations relating to his activities during the May 2000 coup.
The High Court registry has assigned Justice John Byrne, who was recently re-appointed to the Fiji bench, to hear the case.
But it has not indicated when the challenge will be heard.