National Security Advisor Michael Flynn Resigns Over Russia Contacts (2017-02-13)

Michael Flynn resigns as National Security Advisor after it is revealed he lied to Vice President Pence about his conversations with Russian Ambassador Sergey Kislyak during the transition. Flynn urged Kislyak not to escalate US sanctions imposed by the Obama administration for election interference. Flynn later pleads guilty to lying to the FBI. His resignation marks the first major casualty of the Russia investigation.