London: Embattled British Prime Minister Liz Truss on Thursday announced her resignation after an open revolt against her leadership in the Conservative Party.

"I can't deliver the mandate on which I was elected," she said speaking outside Downing Street. Truss said she has told King Charles she is resigning as leader of the Conservative Party. She has been in office for just 45 days - the shortest tenure of any British prime minister. Truss is due to make a statement in Downing Street amid intense speculation about her future.

Thursday's expected move comes after Truss held a hastily arranged meeting with a Conservative official tasked with assessing whether the Prime Minister still has the support of Tory members of Parliament. A growing number of lawmakers is calling for Truss to resign after weeks of turmoil sparked by her economic plan, announced last month and since largely abandoned after it spooked financial markets.