More than two months after he was brought down as prime minister, Malcolm Turnbull says those responsible still need to explain why they took such "self-destructive" action.
He said it was still painful to talk about.
"Particularly when you don't have the answers," Mr Turnbull told ABC's Q&A program.
"Will it be an issue (during a federal election)? Will it be the biggest issue? Will it be a big issue or a medium-sized issue? I don't know.
"But I think Australians are entitled to know the answer."
Mr Turnbull said he takes Scott Morrison at his word that he had no involvement in the plot to bring him down as prime minister.
But he did not hold back in naming the leaders of the "insurgency" that topped him: Home Affairs Minister Peter Dutton, Health Minister Greg Hunt, Finance Minister Mathias Cormann, and former prime minister Tony Abbott
The ousted PM said it appeared Mr Morrison had taken advantage of a situation he did not create in order to become leader of the country.
