Military personnel will erect the tents, but the Department of Homeland Security (DHS) will run the camps, a statement by Pentagon spokesman Major Chris Miller said.

Acting Secretary of Defense Patrick Shanahan approved a DHS request to lend the tents and help "construct temporary facilities to house and care for a minimum of 7,500 total single adult male and female aliens," Miller said.

These migrants will have been processed by Customs and Border Protection agents, "and turned over to Immigration and Customs Enforcement/Enforcement Removal Operations custody."

Military personnel "will conduct site assessments over the next two weeks to determine the scope, cost, and timeline" to erect the tents, Miller said.

The temporary housing sites are set to open in Tucson and Yuma, Arizona, and at four locations in Texas: Tornillo, Donna, Laredo, and Del Rio.

Around 500,000 people have been detained on the US-Mexico border since October 1, 2018.

Most of these people are undocumented migrants from Central America seeking asylum in the United States.

Many migrants are released pending a court hearing on their asylum applications because there is not enough room at the detention sites.