Trump orders inquiry into Biden's actions, alleging 'cognitive decline'

Donald Trump orders investigation into Joe Biden's actions, alleging 'conspiracy' to deceive public about Biden's mental state. Trump and allies question Biden's cognitive abilities, seeking testimony from aides on his 'mental and physical faculties'. Scrutiny over Biden's health intensifies with new book alleging cover-up of his 'physical deterioration' during re-election campaign. Biden denies claims, stating he made decisions during his presidency and dismissing allegations as 'ridiculous and false'.