He announced the move during a ceremony in which he signed another immigration detention measure into law called the Laken Riley Act. Trump said the "migrant facility" at Guantanamo Bay will be used to "detain the worst criminal illegal aliens threatening the American people.

The president said the facility at the U.S. naval base could house as many as 30,000 people

The immigrants living in the U.S. illegally who will be sent to the detention facility are those who have committed crimes, President Trump said.