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NEW YORK, NY - JULY 31: U.S. Secretary of Energy Rick Perry speaks during the Department of Homeland Security's Cybersecurity Summit on July 31, 2018 in New York City. Homeland Security Secretary Kirstjen Nielsen said, 'Cyberattacks now exceed the danger of physical attacks...This has forced us to rethink homeland security.' (Photo by Kevin Hagen/Getty Images)

NEW YORK, NY - JULY 31: U.S. Secretary of Energy Rick Perry speaks during the Department of Homeland Security's Cybersecurity Summit on July 31, 2018 in New York City. Homeland Security Secretary Kirstjen Nielsen said, 'Cyberattacks now exceed the danger of physical attacks...This has forced us to rethink homeland security.' (Photo by Kevin Hagen/Getty Images)