US President-elect Joe Biden pressed ahead with his transition on Wednesday despite Donald Trump’s refusal to acknowledge defeat, naming a seasoned Democratic operative as Chief of Staff in his first public White House personnel choice. Biden tapped longtime aide Ron Klain, who previously served as his first chief of staff while vice president, acknowledging the two had a long road ahead in fighting the coronavirus pandemic as well as healing a deeply divided nation. “His deep, varied experience and capacity to work with people all across the political spectrum are precisely...