Joe Biden's alleged Ambien use raises questions, as the medication is contraindicated for those requiring mental alertness, according to industry guidelines.

Hunter Biden also criticised prominent Hollywood donor to Democrats, George Clooney, who in an op-ed in New York Times last year had urged Joe Biden to withdraw his nomination.

Former President Joe Biden's son, Hunter Biden, said his father's disastrous debate performance against President Donald Trump that led to the Democrat stepping aside as presidential candidate was the result of him taking Ambien due to his travel.