LONDON (AP) — Former British Prime Minister Liz Truss says her failure wasn’t her fault.

Truss on Sunday blamed a “powerful economic establishment” and internal Conservative Party opposition for the rapid collapse of her government, and said she still believes her tax-cutting policies were the right ones.

Britain’s shortest-serving prime minister resigned in October, six weeks into the job, after her inaugural budget plan sparked market mayhem.

Breaking her post-premiership silence in the Sunday Telegraph newspaper, Truss said she underestimated the resistance her free-market policies would face from “the system.”

“I am not claiming to be blameless in what happened, but fundamentally I was not given a realistic chance to enact my policies by a very powerful economic establishment, coupled with a lack of political support,” she wrote.

Truss took office in September after winning a Conservative Party leadership contest to replace scandal-tarnished Prime Minister Boris Johnson. Her promise to spur economic growth with tax cuts and deregulation enthused Tory members, but a budget containing 45 billion pounds ($54 billion) in unfunded tax cuts — including an income tax reduction for the highest earners — spooked the financial markets.

The prospect of more debt and higher inflation sent the pound plunging to its lowest-ever level against the US dollar. The cost of government borrowing soared and the Bank of England had to step in to prop up the bond market and prevent a wider economic meltdown that threatened people’s pensions.

Truss first fired her Treasury chief, Kwasi Kwarteng, then quit herself.

In the article, she claimed her government was made a “scapegoat” for long-brewing instability with liability driven investments, a form of bond market derivatives in which pension funds are heavily invested,

Truss said she still believed her low-tax, small-state agenda “was the right thing to do, but the forces against it were too great.” She claimed “large parts of the media and the wider public sphere” had a left-wing slant, and criticised US President Joe Biden for calling her plan a mistake.

Critics accused the former prime minister of rewriting history and using the populist playbook by blaming the system for her own failures.

Gavin Barwell, a Conservative who was chief of staff to ex-Prime Minister Theresa May, tweeted at Truss: “You were brought down because in a matter of weeks you lost the confidence of the financial markets, the electorate and your own MPs. During a profound cost of living crisis, you thought it was a priority to cut tax for the richest people in the country.”

Cambridge University economist Charles Read said he warned the Treasury in early September that a sudden economic stimulus package “risked financial instability and a financial crisis.

“The mini-budget crisis last autumn was predictable, preventable & avoidable,” he wrote on Twitter.

Truss’ article could put more pressure on Prime Minister Rishi Sunak, a former Treasury chief installed by the Conservatives to calm the markets and steady the government after her departure.