Malcolm Turnbull has declared he would have led the coalition to an election victory over Labor if he'd stayed on as prime minister at the federal election.
Retired cabinet minister Christopher Pyne asked his close friend and former boss if he would have won this year's election had he not been dethroned.
"Oh yeah. Absolutely. There's not many people that doubt that," Mr Turnbull told the Pyne Time podcast.
Prime Minister Scott Morrison, who took over after the leadership spill, backed his predecessor's assessment of his election chances.
"I said at the time of the change that I believed he would too," he told reporters in Adelaide on Monday.
Mr Turnbull had a blunt message for the Liberal insurgency which tried to install Home Affairs Minister Peter Dutton as prime minister before Mr Morrison rose to power.
"They didn't get the outcome they wanted. Quite a lot of them would have found Morrison even less palatable than me," he said.
"They ended up with Morrison. They didn't get Dutton, which is what they wanted."
Mr Turnbull poured cold water on suggestions he should have put long-time rival Tony Abbott in cabinet to stop him from damaging the government.
"Nobody thought that was a good idea, except for him obviously and a couple of others," he said.
On his achievements as prime minister, Mr Turnbull nominated legislating same-sex marriage after the postal vote among his biggest.
"I looked at the arguments against it and they are bonkers," he said.
"The idea that my marriage to Lucy of nearly than 40 years is threatened by the gay couple around the corner deciding to get married, it is laughable."
He conceded the debate surrounding the plebiscite was hurtful and tough for some, but the emphatic 'yes' victory was a proud moment for Australia.
"If you were a young kid troubled about your sexual identity, that plebiscite says nearly two-thirds of Australians are saying to you 'we're cool, we love you'," Mr Turnbull said.
Australian Associated Press