Liz Truss has apologised for her "mistakes" and pledged to lead the Tories into the next general election as she desperately clings to power.
The Prime Minister admitted she "made a mistake" with her disastrous mini-Budget after it sent the markets into turmoil.
She is now fighting for survival after her new Chancellor Jeremy Hunt announced a screeching U-turn on her package of tax cuts.
Ms Truss said she wanted to "accept responsibility and say sorry for the mistakes that have been made".
She told the BBC: "I do think it is the mark of an honest politician who does say, yes, I've made a mistake.
"I do want to accept responsibility and say sorry, for the mistakes that have been made.
"I wanted to act but to help people with their energy bills to deal with the issue of high taxes, but we went too far and too fast.
"I've acknowledged that. I put in place a new chancellor with a new strategy to restore economic stability."
She said she is "sticking around" because she was "elected to deliver for this country", adding: "I will lead the Conservatives into the next general election."
The pressure on the Prime Minister gained traction on Monday evening with five Tories now openly calling for her to go after just six weeks in power.
Sir Charles Walker was the latest to make the case for her exit.
He told Sky News' Beth Rigby: "I think her position is untenable. She has put colleagues, the country, through a huge amount of unnecessary pain and upset and worry."
The situation "can only be remedied" with "a new prime minister", he said.
However, Ms Truss tonight slammed her own MPs after some of them claimed she had sealed the party's fate at the next election.
She said: "What I say to them is that we should be focusing on the people of the United Kingdom and how we deliver for them.
"I don't think people want to hear about internal discussions in the Conservative Party."
She added: "My message to my colleagues is yes, I completely acknowledge that there have been mistakes.
"I have acted swiftly to fix those mistakes. I've been honest about what those mistakes were.
"And what we now need to do is move forward and deliver for the country because that's ultimately, that's ultimately what people care about."
She described sacking her "friend" Kwasi Kwarteng as Chancellor as a "painful" decision but insisted it was right for the country.
Earlier, the Prime Minister's press secretary said there had been no point on Monday when Ms Truss thought her time was up.
Conservative Party chairman Jake Berry said there had been a focus on "unity" as Ms Truss addressed a gathering of the One Nation group of Tory MPs in Westminster.
He said she had been "exceptional" and he had not heard any irritation towards her in the meeting, although it was still going on.