January 29, 2016: 22 emails retroactively deemed “top secret” had been sent through Clinton’s private server.

This is revealed by the State Department. However, the department will not make public any part of the 22 emails, not even the years they were sent or who sent them, because they contain such highly classified information. It is believed the 22 emails occurred in seven different email chains. (The New York Times, 1/29/2016) The US government defines “top secret” as “information, the unauthorized disclosure of which reasonably could be expected to cause exceptionally grave damage to the national security.” (The New York Observer, 2/1/2016) 

A Clinton spokesperson claims that none of those emails originated with Clinton. (The Washington Post, 3/27/2016)