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... It's not clear how many beds Guantanamo has, or how Mr. Trump arrived at that number. The president has previously floated the idea of sending migrants with criminal backgrounds to be detained or imprisoned outside the U.S., although the logistics and legalities of such a feat remain unclear.

The base also includes a facility, known as the Migrant Operations Center, where U.S. immigration officials have screened some asylum-seekers intercepted at sea for years. That area is separate from the detention center, the post-9/11 military prison where the U.S. still holds 15 terrorism suspects. The U.S. military prison at Guantanamo was opened in January 2002 and was designated for War on Terror suspects. ...

The base also includes a facility, known as the Migrant Operations Center, where U.S. immigration officials have screened some asylum-seekers intercepted at sea for years. That area is separate from the detention center, the post-9/11 military prison where the U.S. still holds 15 terrorism suspects. The U.S. military prison at Guantanamo was opened in January 2002 and was designated for War on Terror suspects.

A relatively small number of migrants are housed there while they undergo interviews with asylum officers. Asylum-seekers who passed those initial interviews have been referred for resettlement in third countries like Australia. They are not allowed into the U.S. -- a policy to deter maritime migration.

The Trump administration's "border czar" Tom Homan suggested today the president's plan would expand the current facility.