Following the attack on his Republican rival Donald Trump, US President Joe Biden has stressed “the need for us to lower the temperature in our politics,” calling on the public to “remember, while we may disagree, we are not enemies.” “In America, we resolve our difference at the ballot box, not with bullets,” Biden said in an address to the nation from the White House on Sunday evening. “The power to change America should always rest in the hands of the people, not in the hands of a would-be assassin,” the president said. “You know, the path forward through competing visions of the campaign s…