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He previously served as a senior policy adviser at the Biden-Harris White House National Economic Council and as a volunteer on the Biden-Harris transition team.

Ahead of his inauguration, Trump's transition team said Oz would "work closely" with US Health Secretary Robert F Kennedy Jr to "take on the illness industrial complex".

But she added: "I know this news will be very unsettling. The transition team will develop plans over the coming weeks and we know that colleagues will want this to be completed as soon as possible to provide future certainty."

Sir Jim Mackey, the incoming interim chief executive due to replace Ms Pritchard from April, is set to oversee "a transition team" that will push through the "radical reduction and reshaping of the centre with the DHSC".

Despite key figures in the Trump transition team, including Ratcliffe, receiving briefs about the value of intelligence sharing with Ukraine, a senior U.S. military official told CNN that the U.S. had already instituted a rollback, including a reduction in intelligence, surveillance and reconnaissance flights that could impair Ukraine's ability to conduct both offensive and defensive operations.