DHS says nationwide ground stop was not a cyberattack: 'We are built to handle crisis like this'

Homeland Security Secretary Markwayne Mullin told reporters during a Friday night White House briefing that there was no sign of a cyberattack in today’s ground stoppage.

Homeland Security Secretary Markwayne Mullin told reporters during a Friday night White House briefing that there was no sign of a cyberattack in today’s ground stoppage.