Tonga's caretaker prime minister, 'Akilisi Pohiva, says the king should only be a ceremonial figure.
Mr Pohiva was speaking after the removal of his government and the calling of new elections over allegations he had been seeking to reduce the authority of King Tupou VI.
But he said power should rest with those elected by the people.
Radio Tonga reported him saying Tongans should learn from historical events and the path the world is taking.
The Prime Minister said the most important principle to be upheld is accountability, with the executive accounting to each other as well as the people who elected them.
He said through this transparent relationship those who abuse powers should be sacked.