To find out, Kelly ordered a briefingbook from some high-toned outfit like the Economist Intelligence Unit (EIU), an offshoot of The Economist magazine.
In particular, the BriefingBook draws on recent and authoritative declarations made by those at the highest levels of the U.S. government with responsibility for assuring the viability of the U.S. nuclear deterrent.
In addition, the book's authors and an expanded group of trainers are briefing its findings and recommendations to senior law enforcement, armed forces, intelligence, homeland security and other national security professionals.
Last night, in briefing his senior advisors on his decision, essentially it's closing the book on the internal deliberations that have lasted months over this and there's been some sharp disagreements on approach.