Mullin pressed on FAA ground stop, Iran threats targeting Trump

Homeland Security Secretary Markwayne Mullin joins 'The Sunday Briefing' to discuss the growing national security threat of drone attacks and the recent FAA nationwide ground stop.

Homeland Security Secretary Markwayne Mullin joins 'The Sunday Briefing' to discuss the agency's efforts to combat hostile drone technology and Iranian threats targeting President Donald Trump and top administration officials. Mullin also addresses the massive FAA flight ground stop, pushing back on rumors of a cyberattack.