On 11 May 2007, following the death of
Malietoa Tanumafili II, Samoa's head of state since independence in 1962, Tupua assumed the functions of acting head of state with Tuimalealiʻifano, as members of the Council of Deputies. He was sworn into office on 20 June 2007. He was
re-elected in July 2012 by a majority vote of the Legislative Assembly. However, he was not re-appointed as of 20 July 2017 after a controversial move by the Prime Minister which saw a legislative assembly vote of 23 to 15. This was after an initial vote that was taken, which saw the
tamaʻāiga gain the majority of support from the ruling HRPP caucus. This was seen as but a mere formality and that Tui Ātua would again be elected to office to serve as Head of State. However, owing to decades of tension with the then-Prime Minister
Tuilaʻepa Saʻilele Malielegaoi, Tui Ātua was instead replaced in a backroom vote by another tamaʻāiga
, Tuimalealiʻifano Vaʻaletoʻa Sualauvi II. In December 2024 he was reappointed to the Council of Deputies. He was sworn in in January 2025. ==Academia==