State Dept: Hillary Clinton failed to hand over key email

Former Secretary Hillary Clinton failed to turn over a copy of a key message involving problems caused by her use of a private homebrew email server, the State Department confirmed Thursday. The disclosure makes it unclear what other work-related emails may have been deleted by the presumptive Democratic presidential nominee.The email was included within messages exchanged Nov. 13, 2010, between Clinton and one of her closest aides, Deputy Chief of Staff Huma Abedin. At the time, emails sent fro