Tuivaga, who hails from the village of Yaroi on Matuku Island, in the Lau archipelago, is the son of Isimeili Siga Tuivaga and Jessie Hill.
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In what the Fijian government saw as a humiliation, he was forced to withdraw his nomination during the balloting on 9 February 2003, when Samoan candidate Tuiloma Neroni Slade outpolled him.
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He was appointed to the Crown Council in 1965, becoming their principal legal officer in 1968.
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On 26 May 2005, the Rev. Akuila Yabaki of the Citizens Constitutional Forum expressed concern at reports that Tuivaga might be appointed to chair the proposed commission, reports downplayed by both Prime Minister Laisenia Qarase and Opposition Leader Mahendra Chaudhry.