The executive order requires the command to deliver both a contingency and campaign plan to "provide steady-state southern border security."

Inaugural-day executive order instructs NORTHCOM to “repel forms of invasion”—a legal formulation that might not stick.

WASHINGTON − President Donald Trump on Monday declared a national border emergency and ordered the U.S. armed forces to repel "forms of invasion" at the U.S.-Mexico border, including illegal migration and drug trafficking.

WASHINGTON—Pentagon officials are planning options for using federal troops to secure the U.S.-Mexico border against drug traffickers, human smugglers and migrants, a potentially major shift in military priorities ordered by President Trump,