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12.57am BST

- Joan E Greve and Maanvi Singh

12.34am BST

In a keenly awaited memoir, Joe Biden's son Hunter attacks Donald Trump as a vile man with a vile mission" who plumbed unprecedented depths" in last year's US presidential election.

Hunter, 51, is a lawyer and businessman who has been the focus of Republican bile ever since Trump and his lawyer Rudy Giuliani sought information on his business dealings in Ukraine to use in the 2020 campaign.

Related: Hunter Biden calls Trump 'vile' in new book and denies Ukraine allegations