WASHINGTON: Donald Trump pleaded not guilty on Thursday to federal charges that he orchestrated a plot to try to overturn his 2020 election loss in what US prosecutors call an unprecedented effort by the then-president to undermine the pillars of American democracy.Trump, the front-runner for the 2024 Republican presidential nomination, entered his plea in a Washington courtroom half a mile (1 km) from the US Capitol, the building his supporters stormed on Jan.6, 2021, to try to stop Congress from certifying his defeat.The plea - the third for...