Most people don’t even know that we have 30,000 beds in Guantanamo to detain the worst criminal illegal aliens threatening the American people.”

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.

Where is Guantanamo Bay? Here's what to know about mass detention facility that President Donald Trump plans to use to house migrants.