More than half of the memos former FBI Director James Comey wrote as personal recollections of his conversations with President Trump about the Russia investigation have been determined to contain classified information, according to interviews with officials familiar with the documents.

This revelation raises the possibility that Comey broke his own agency's rules and ignored the same security protocol that he publicly criticized Hillary Clinton for in the waning days of the 2016 presidential election.

Comey testified last month he considered the memos to be personal documents and that he shared at least one of them with a friend. He asked that friend, a lawyer at Columbia University, to leak information from one memo to the news media in hopes of increasing pressure to get a special prosecutor named in the Russia case after Comey was fired as FBI director. 

"So you didn't consider your memo or your sense of that conversation to be a government document?" Sen. Roy Blunt (R-Mo.) asked Comey on June 8. "You considered it to be, somehow, your own personal document that you could share to the media as you wanted through a friend?"

"Correct," Comey answered. "I understood this to be my recollection recorded of my conversation with the president. As a private citizen, I thought it important to get it out." 

Comey insisted in his testimony he believed his personal memos were unclassified, though he hinted one or two documents he created might have been contained classified information.

"I immediately prepared an unclassified memo of the conversation about Flynn and discussed the matter with FBI senior leadership," he testified about the one memo he later leaked about former national security adviser Michael Flynn.

He added, "My view was that the content of those unclassified memorialization of those conversations was my recollection recorded."