As tents went up in Guantanamo Bay, Cuba to hold migrants, attorneys at the Department of Homeland Security and Pentagon were still trying to determine whether it was legal to take the unprecedented step of flying migrants from the US southern border to the facility,

Just days after signing an executive order to enable the military prison at Guantanamo Bay, Trump is sending the first undocumented immigrants.

The Trump administration on Tuesday began flights transporting "criminal aliens" to Guantanamo Bay, with plans in the works to use the Cuban detention facility to eventually hold thousands of other migrants.