Former UK Chancellor Kwasi Kwarteng has said he warned Liz Truss she was going too fast with her ill-fated economic plans.
In his first interview since he was sacked by the then Prime Minister, Mr Kwarteng said he had warned her to "slow down" after September's mini-Budget.
He said he told her it was "mad" to fire him, and she would only last "three or four weeks" if she did.
"Little did I know it was only going to be six days," he added.
Mr Kwarteng was dramatically fired by Ms Truss in October, two weeks after their tax-cutting mini-Budget sparked turmoil on financial markets.
She then ditched almost all of the plan in a bid to stay in power, but announced her resignation a few days later - less than seven weeks after taking office.
Support ebbed away
The BBC says support from Conservative MPs for Ms Truss had ebbed away.
Mr Kwarteng said that he had warned Ms Truss about going at a "breakneck speed" with economic measures after the mini-Budget.
"She said: 'Well, I've only got two years.' And I said: 'You will have two months if you carry on like this.'. And that is, I'm afraid, what happened."
He also said: "I think the prime minister was very much of the view that we needed to move things fast. But I think it was too quick."
Mr Kwarteng, a long-time political ally and friend of Ms Truss, revealed the then-PM was "distressed and emotional" when she called him in to be fired, after summoning him back from a trip to the US.
He also revealed he found out he was going to be sacked when he saw a journalist tweeting about it while he was in the car going to Downing Street.
'This is mad'
He said he had told her: "This is mad. Prime ministers don't get rid of chancellors."
The former chancellor said he did not think the prime minister could fire him "just for implementing what she campaigned on" during her summer Tory leadership campaign.
He highlighted pledges to scrap a planned increase in Corporation Tax and reverse a rise in National Insurance as having been central to her platform.
Mr Kwarteng joined Ms Truss's in arguing that low taxes and policy aimed at encouraging private investment were the best ways to boost economic growth.
During his time as chancellor, he repeatedly advocated measures of the sort set out in the mini-Budget, and two days after delivering it told the BBC there was "more to come" in the way of tax cuts.
The comment, along with a decision to announce the mini-Budget without publishing an assessment by the government's fiscal watchdog, was later seen as key to convincing investors that the government did not have a credible plan to keep debt levels under control.
Ms Truss is yet to comment on her time in office since quitting Downing Street last month.