The former president has called the investigation into his competence to serve in the White House as "nothing more than a distraction."

Donald Trump has ordered his administration to launch a probe into Joe Biden's actions as US President over claims that aides concealed his predecessor's alleged "cognitive decline". The order marked a significant escalation in Mr Trump's targeting of political adversaries and could potentially pave the way for the billionaire to push claims that the range of 81-year-old Mr Biden's actions as president were invalid.