WASHINGTON, D.C.: Caroline Kennedy, the US ambassador to Japan and daughter of late president John F. Kennedy, was criticized on Tuesday for using private email for official business. The latest revelations about a high-ranking diplomat were given greater resonance in the light of the scandal hanging over former secretary of state Hillary Clinton. A report by the State Department inspector general into the management of the Tokyo embassy tagged Kennedy with a similar charge to the one dogging the White House candidate. State Department guidelines require staff to use official email accounts—judged more secure—to send government business, which then form part of the historical and legal record of their posts. During her term leading the department between 2009 and 2013, Clinton departed from this protocol and used a personal server and private account for all email.