John Schindler, a former National Security Agency (NSA) counterintelligence officer, claims that, “Discussions with Intelligence Community officials have revealed that Ms. Clinton’s ‘unclassified’ emails included Holy Grail items of American espionage such as the true names of Central Intelligence Agency [CIA] intelligence officers serving overseas under cover. Worse, some of those exposed are serving under non-official cover. […] At a minimum, valuable covers have been blown, careers have been ruined, and lives have been put at serious risk.” Additionally, some names of foreigners who are on the CIA payroll are mentioned.
One unnamed senior Intelligence Community official says that because of the likelihood that foreign governments have accessed all of Clinton’s emails, “It’s a death sentence. If we’re lucky, only agents, not our officers, will get killed because of this.”
Schindler comments, “Her defense seems to be that neither she nor anybody on her staff were able to recognize that top secret information was actually top secret, which is hardly a ringing endorsement of Hillary’s qualifications to be our next commander-in-chief.” (The New York Observer, 2/1/2016)
Four days later, a NBC News article comments on the same topic with more modest claims. According to unnamed US officials, the references to undercover officers were indirect and Clinton made no comment about them.
The article adds, “Some of the references to covert intelligence officers, and other discussions of CIA drone strikes, were against classification rules and were ‘sloppy,’ one official said. But views are split on whether they were damaging to national security.” (NBC News, 2/4/2016)