Democrats hammered Homeland Security Secretary Markwayne Mullin Tuesday during a heated Senate hearing, calling his threats to pull officers from some airports in so-called sanctuary cities "insane" and accusing his department of recklessly spending billions of dollars.

Homeland Security Secretary Markwayne Mullin has a plan to punish cities that don’t enforce federal immigration policies

Watch live as Department of Homeland Security Secretary Markwayne Mullin holds a news conference in Dallas to address threats that ICE agents currently face.