JEREMY Hunt signalled on Saturday his plan to up-end the Prime Minister’s entire economic strategy, in an extraordinary rebuke of the pledges that brought her into office.

Jeremy Hunt, widely seen now as the most powerful figure in Government, used a series of broadcast interviews on Saturday morning to signal that Truss’s immediate economic plan is now defunct as he suggested that tax rises could form part of a painful fiscal package designed to restore market confidence in the UK.

Hunt, a former foreign secretary, was parachuted into Number 11 to replace Kwasi Kwarteng in a bid to restore order to Truss’s ailing administration.

In his first full day in office, he warned of “difficult decisions” to come as he suggested that taxes could rise and budgets – including on health and defence – would likely be squeezed further in the coming months.

He said that all government departments would have to make "efficiencies".

When asked if that included the Department for Health, he simply repeated the word "all".

Truss on Friday sacked her friend and chancellor Kwasi Kwarteng and ditched her commitment to drop the planned rise in corporation tax from 19% to 25%, after three weeks of turmoil on the financial markets in the wake of Kwarteng’s £43 billion mini-budget tax giveaway.

Hunt, twice a Tory leadership contender, wasted no time in criticising the mini-budget but endorsed the “fundamentals” of the push for growth.

He told Sky News: “It was a mistake when we’re going to be asking for difficult decisions across the board on tax and spending to cut the rate of tax paid by the very wealthiest.

“It was a mistake to fly blind and to do these forecasts without giving people the confidence of the Office of Budget Responsibility saying that the sums add up.”

“The Prime Minister’s recognised that, that’s why I’m here.”

Allies of Hunt had likened his new role to that of the “chief executive” in government and on Saturday Hunt acknowledged that the Prime Minister had effectively relinquished control of the public finances over to him.

The Chancellor, who will meet with Treasury officials later and with Truss at Chequers on Sunday, told BBC Radio 4’s Today programme he now had a “clean slate” on the mini-budget, as he prepares to deliver a highly anticipated fiscal statement on October 31.

“I’m leaving open all possibilities this morning,” he said.

Nonetheless, his comments indicated that cuts to public spending and tax rises could be coming.

“Spending will not rise by as much as people would like and all Government departments are going to have to find more efficiencies than they were planning to.”

“And some taxes will not be cut as quickly as people want.

“Some taxes will go up. So it’s going to be difficult.”

Appearing to rule out an early election, Hunt repeatedly insisted that voters now wanted stability and in 18 months’ time would be able to “judge” Truss at the ballot box.

READ MORE: SNP accuse Prime Minister Liz Truss of misleading Parliament over spending cuts

But Hunt’s comments may only add to the sense among some Tory MPs that Truss is increasingly powerless in Downing Street, with her party split about its next steps.

At a brief news conference in Downing Street on Friday, the Prime Minister dismissed calls for her resignation, saying she is “absolutely determined to see through what I have promised”.

“It is clear that parts of our mini-budget went further and faster than markets were expecting, so the way we are delivering our mission right now has to change,” she said.

“We will do whatever is necessary to ensure debt is falling as a share of the economy in the medium term.”

But it comes amid multiple reports of Tory MPs and Conservative grandees plotting moves to force her from office even as Cabinet ministers remained publicly loyal to the Prime Minister.

The Times newspaper even cited a source apparently close to Kwarteng suggesting that Truss may only have bought herself a few more weeks in office.

To many observers, it appeared the end could be nigh for the Prime Minister after only a few weeks in the job.

Former Conservative leader Lord Hague warned Truss’s premiership “hangs by a thread”, while Conservative former chancellor Lord Hammond said the events of the past weeks had wrecked the party’s reputation for fiscal discipline.

Loyal MPs on Friday night were urging party colleagues to think again about any bid to oust Truss, who is theoretically safe from a leadership vote for another year under the rules of the backbench 1922 Committee.

Welsh Secretary Sir Robert Buckland, appearing on BBC Radio 4’s Any Questions programme, warned: “I think if we start with gay abandon, throwing another prime minister to the wolves, we’re going to be faced with more delay, more debate, more instability.”

But even the staunchly loyal MP Sir Christopher Chope had some harsh words for his party leader, after defending her on Thursday and ruling out any reversal.

“I feel let down, very badly let down. And I expressed disbelief at what I heard today because it’s totally inconsistent with everything that the Prime Minister stood for when she was elected,” he told BBC Newsnight.

The promise of a new direction, yet again, for the Conservative government also appeared to cause unrest among the party’s free marketeers.

Thatcherite Tory MP John Redwood offered an early warning to the new Chancellor, tweeting: “You cannot tax your way to higher growth. If you tax too much you end up borrowing more as you have a worse slowdown.”

Meanwhile, Labour rejected any suggestion that Hunt could help solve the crisis.

Shadow chancellor Rachel Reeves said: “The damage has been done. It’s clear they’ve got no plan to clean up their mess. At a time when people’s mortgages are skyrocketing and businesses have no certainty, the contradictory, chaotic messages coming from Downing Street are totally unacceptable."