The US Congress will certify Donald Trump’s presidential election victory on Monday in an event heavy with symbolism four years to the day since the he incited a violent mob to disrupt a similar ceremony in a bid to overturn his 2020 election defeat. The vice-president, Kamala Harris, Trump’s defeated Democratic opponent in November’s election, will preside over a joint Senate and House of Representatives session to validate the result, which longstanding convention dictates should be a mere formality in the peaceful transfer of power. However, the proceedings will take place amid unprecedented security measures from US Capitol and Washington