Mullin warns terrorists, cartels are joining forces against US

Homeland Security Secretary Markwayne Mullin joins 'The Sunday Briefing' to discuss border security, drug cartel drone activity and cyber threats. He also details President Donald Trump's border enforcement policies.

Homeland Security Secretary Markwayne Mullin joins 'The Sunday Briefing' to outline federal efforts against Mexican cartel alliances, evolving drone and foreign cyber threats and calls by progressive lawmakers to reduce funding for border enforcement agencies.