The Pentagon is set to begin a drawdown of its 5,800 troops from the Southwest border as early as this week, the Army commander overseeing the mission told POLITICO today — even as the approaching caravan of refugees prompted U.S. customs officers to close a port of entry near Tijuana, Mexico.

All the active-duty troops that President Donald Trump ordered sent to the border before the midterm elections should be home by Christmas, said Army Lt. Gen. Jeffrey Buchanan, who is running the mission from San Antonio, Texas.

Buchanan also confirmed previous reports that the military rejected a request from the Department of Homeland Security for an armed force to back up Border Patrol agents in the event of a violent confrontation.