Lord Nuku was appointed to Cabinet as Minister of Police, Prison and Fire Services in 2005, forcing him to resign his seat in the Legislative Assembly and causing a by-election.

[2] Following political reforms requiring Cabinet Ministers to be members of the Legislative Assembly, he stood in the 2010 election but failed to secure a seat.

[6] During his time in the Legislative Assembly, he has advocated for better tsunami evacuation plans,[7] and supported subsidies for school fees in the wake of Cyclone Gita.

[8] In February 2019, Nuku presented a petition from Tonga's nobles calling for the government to be investigated and parliament to be dissolved.

[15] In October 2020 as part of litigation over the debt, Tonga's Chief Justice ruled that Valevale's evidence was unreliable, and that he had refused to cooperate with the court and tried to hide his financial status.