Former US President Donald Trump has been charged with plotting to overturn his 2020 election defeat. The charges include conspiracy to defraud the US, tampering with a witness, and conspiracy against the rights of citizens. The indictment stems from an inquiry into the events surrounding the January 6, 2021, riot at the US Capitol. Trump denies wrongdoing and has called the case "ridiculous." He is also facing charges in two other cases related to mishandling classified files and falsifying business records. The investigation has focused on Trump's actions in the two months between his election loss and the Capitol riot, where his supporters stormed Congress. The former president is due to appear in court in Washington DC, and the charges complicate his second run for the White House.