Jim Webb said during Tuesday's Democratic debate that the greatest "day to day" national security threat is cyber warfare.
Whether cyber warfare is the single largest threat to the United States, or merely among the biggest, is besides the point. What matters is that Webb was the only presidential candidate to even mention cybersecurity, a subject that deserves more attention.
America's top intelligence officials testified before Congress last month that cyberattacks are growing more severe, and the country doesn't have sufficient protections in place to prevent a serious cyber catastrophe.
That doomsday scenario involves a foreign country attacking the electrical grid, shutting off power across the country. Or perhaps it's an attack on the computer systems controlling stock trading. An attack on command and control centers for nuclear facilities might even be possible.
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Jim Webb, Webb Campaign Press Release - This is the Cyber Warfare Jim Webb Was Talking About Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/313237