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

Donald Trump has ordered an investigation into Joe Biden's actions during his presidency, accusing aides of a "conspiracy" to "deceive the public about Biden's mental state".

In this latest move to discredit his predecessor, Trump took aim at the aides' use of an autopen - a device that replicates signatures which presidents, including Trump, have used for decades - to sign executive actions.