Latest "Department of Homeland Security Secretary Kirstjen Nielsen" stories

Mattis explains new roles, authorities at border

The new authorities allow for lethal use of force, some law enforcement activity — but Mattis said troops will not violate Posse Comitatus

By Tara Copp, Associated Press

5 years ago

Mattis to visit border troops; still no cost estimate for mission

Up to 7,000 active-duty forces are responding to the caravan. But are they in the right place?

By Tara Copp, Associated Press

5 years ago