Britain's former finance minister Rishi Sunak confirmed on Sunday he was standing to replace Liz Truss as prime minister.

"The United Kingdom is a great country but we face a profound economic crisis," he said on Twitter.

"That's why I am standing to be leader of the Conservative Party and your next prime minister."

Sunak was defeated by Truss in the race to replace Boris Johnson in September after losing an election held by members of the Conservative party across the country.

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Rishi Sunak on stage

Rishi Sunak addresses a Conservative Party leadership election hustings at the NEC, Birmingham, England, Tuesday, Aug. 23, 2022.  (AP Photo/Rui Vieira, File)

Even before declaring on Sunday, Sunak had received more support from Conservative lawmakers than his rivals - former defense minister Penny Mordaunt and Johnson, who is attempting a comeback.

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Boris Johnson speaks at podium at 10 Downing Street

Outgoing British Prime Minister Boris Johnson speaks outside Downing Street in London, Tuesday, Sept. 6, 2022 before heading to Balmoral in Scotland, where he will announce his resignation to Britain's Queen Elizabeth II. Later on Tuesday Liz Truss will formally become Britain's new Prime Minister after an audience with the Queen. (AP Photo/Kirsty Wigglesworth)

Sunak quit Johnson's government in July, helping trigger a rebellion that bought him down.

Liz Truss speaks at podium out front of 10 Downing Street

Britain's Prime Minister Liz Truss addresses the media in Downing Street in London, Thursday, Oct. 20, 2022. (AP Photo/Alberto Pezzali)

"There will be integrity, professionalism and accountability at every level of the government I lead and I will work day in and day out to get the job done," he said in a statement.

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"I am asking you for the opportunity to help fix our problems."