The order will deploy 1,500 troops to build physical barriers, but they will not be used for law enforcement, a military official says.

Troops have assisted at the border before and will be limited to support roles unless the administration invokes the Insurrection Act.

Trump signed executive orders aimed at building military presence along the border and designating cartels as foreign terrorist groups, here's what's next.

U.S. officials say the Pentagon will begin deploying as many as 1,500 active duty troops to help secure the southern border in the coming days