The “In Brief” podcast brings you The Cipher Brief’s take on breaking news stories with leading experts in the global security space. With the resignation of National Security Advisor Michael Flynn, there have been questions about the security implications of his conversations with the Russian Ambassador during the transition period. But speaking to The Cipher Brief’s Leone Lakhani, Jack Keane, retired four-star general and former Vice Chief of Staff of the U.S. Army, says he doesn’t believe it was a security violation. Rather, he says, it was a matter of broken trust.