McCain opposes splitting NSA and Cyber Command

The head of the Senate Armed Services Committee is threatening to block any nominee to head up the National Security Agency if the Obama administration follows through on a plan to decouple the spy agency from U.S. Cyber Command, the digital warfare unit established in 2009.[ Related: U.S. Cyber Command struggles to retain top cybersecurity talent ]At a hearing on cybersecurity and encryption this week, Sen. John McCain (R-Ariz.) argued for preserving the current "dual hat" operating structure w