The minister was speaking at the UNP May Day rally.
Investigations so far have revealed where Namal has hidden his illegally-amassed wealth and about the palaces owned by him, he said.
All those who had committed fraud and corruption during the previous regime will be made to kneel down before the people, said Karunanayake.
His statement is given below:
Voice
Rajapaksas' fate
Meanwhile, ex-president Mahinda Rajapaksa said MPs who attended the Kirulapone May Day rally would have to face legal action soon.
He told the Kirulapone event organized by the joint opposition that he had been warned that Namal, Gotabhaya and Basil would have to appear for various investigations.