US President Joe Biden says he will make a special address the nation later on Sunday and called for unity in the wake of the assassination attempt on former US president Donald Trump. “We must unite as one nation to demonstrate who we are,” Biden said at the White House, ahead of a planned address from the Oval Office later on Sunday. Such national speeches from the President’s office in the White House are typically reserved for moments of crisis and major turning points in the country. Biden once again strongly condemned the shooting of former President and current Republican presidential c…