Akilisi Pohiva is accused of nepotism for hiring his son as his assistant and of putting people into high ranking government positions without due process.
RNZ reports Mr Pohiva is also under fire for trying to remove the Attorney General and the CEO of the Pacific Games Organising Committee.
And he is criticised for wasting money, defending a former Cabinet Minister who was found guilty of bribery charges and for damaging relations between Tonga and Indonesia with comments supporting West Papuan independence.
But the Prime Minister said, despite the claims, he still has the majority support of parliament.
"All the allegations have been raised in parliament just last year and also at the beginning of our session this year. They were all discussed but they just formally put it on paper. But as I said, my office and also cabinet ministers, were able to answer, to provide the answers for all these accusations."
'Akilisi Pohiva's official response will be tabled in parliament shortly.