Amid accusations from Libyans and leading senators on Capitol Hill that the U.S. diplomatic office in Benghazi, Libya, was not adequately protected, top State Department officials offered the agency's most vigorous defense yet of security measures taken to fortify the post in the months before last week's deadly attack on the compound. The sources, who spoke on the condition they only be identified as senior State Department officials because of the sensitive nature of the information, agreed to speak to CNN to respond to claims the United States did not respond to warnings about the dangerous conditions in Benghazi. The...