Scotland Yard has said the man arrested as part of Operation Yewtree is not a new person in the inquiry.
A Metropolitan Police spokesman said the service has spoken to 17 people as part of the investigation, adding: "This is not a new individual to Operation Yewtree. This is not an 18th individual."
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The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.