RNZ reports Lord Vaea's comments follow last week's dismissal of Fe'ao Vakata as Internal Affairs Minister after he reportedly threw a wine glass at a senior civil servant.
Lord Vaea has been warning of a vote of no-confidence for over a month but has been stymied by the adjournment of parliament until the 3rd of October.
Prime Minister 'Akilisi Pohiva said he had the support of his cabinet and the people of Tonga, and could withstand such a motion.
But Lord Vaea said the handling of Mr Vakata's incident had not been a good look for the government.
