President-elect Donald Trump’s chief of staff Susie Wiles sent a message Sunday ordering nominees to refrain from any posting on social media as Senate confirmation hearings are scheduled to start next week. “While this instruction has been delivered previously, I am reiterating that no member of the incoming administration or Transition speaks for the United States or the President-elect himself,” Wiles wrote in a memo obtained by The Post. “Accordingly, all intended nominees should...