Wes Streeting has spent much of the last year insisting he was not about to launch a leadership bid against Sir Keir Starmer.
That continues to be his position in public - but the health secretary's supporters have told the BBC they expect him to launch a challenge to the prime minister as soon as tomorrow.
The 43 year-old minister has made no secret of his desire to hold the top job one day, although he had previously denied he would challenge Sir Keir directly.
He is not the only high profile figure at the centre of leadership speculation - but unlike Angela Rayner and Andy Burnham he is a member of Sir Keir's cabinet
Streeting is regarded as one of Labour's best communicators, and has regularly been sent out to defend the government in the media.
His supporters believe he has the political skills and fluent style to sell the party's message more effectively than the current leader but as a figure on the right of the party he might struggle to appeal to more left-leaning colleagues.
He has become a strong advocate for decentralising the service, and an enthusiast for greater use of technology in healthcare, promising an "online hospital service" for nine conditions through the NHS app in 2027.
But he has also ruffled feathers in the sector with pledges to fire under-performing NHS managers and his willingness to describe the health service as "broken".
Meanwhile, his willingness to talk up the role of private providers in the NHS has drawn criticism from his critics on the left of the party.
He will need to use all his skills of persuasion to win over support outside his own wing of the party, as he plots a course to Downing Street.
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