U.S. Army soldiers from Ft. Riley, Kansas, put up barbed wire fence for an encampment to be used by the military near the U.S. Mexico border in Donna, Texas, U.S., November 4, 2018.

A U.S. Custom and Border Protection agent takes part in a drill to protect the crossing gates against people who want to cross the border illegally on the international bridge between Mexico and the U.S., in Ciudad Juarez, Mexico October 29 , 2018.

U.S. Army soldiers install a barbed wire fence along Anzalduas International Bridge near the U.S.- Mexico border in McAllen, Texas, November 5, 2018.

U.S. Custom and Border Protection agents with full riot gear take part in a drill to protect the crossing gates against people who want to cross the border illegally on the international bridge between Mexico and the U.S., in Ciudad Juarez, Mexico October 29, 2018.

A U.S. Army soldier from Ft. Riley, Kansas, installs barbed wire fence for an encampment to be used by the military near the U.S. Mexico border in Donna, Texas, U.S., November 4, 2018.

U.S Custom and Border Protection agents take part in a drill to protect the crossing gates against people who want to cross the border illegally on the international bridge between Mexico and the U.S., in Ciudad Juarez, Mexico October 29, 2018.

U.S. Army soldier Greg Calvert from Ft. Riley, Kansas, installs barbed wire fence for an encampment to be used by the military near the U.S. Mexico border in Donna, Texas, U.S., November 4, 2018.

U.S Custom and Border Protection agents take part on a drill to protect the gates, for thouse who want to cross the border illegally on the international bridge between Mexico and the U.S., in Ciudad Juarez, Mexico October 29 , 2018.

U.S. Army soldiers from Ft. Riley, Kansas, put up barbed wire fence for an encampment to be used by the military near the U.S. Mexico border in Donna, Texas, U.S., November 4, 2018. Image used for illustrative purpose.

U.S. Army soldiers are seen installing barbed wire fence along the Anzalduas International Bridge near the U.S.-Mexico border in McAllen, Texas, U.S., November 5, 2018.

U.S. Army soldiers from Ft. Riley, Kansas, put up barbed wire fence for an encampment to be used by the military near the U.S. Mexico border in Donna, Texas, U.S., November 4, 2018.