President Donald Trump announced Wednesday he plans to send 30,000 criminal illegal aliens to Guantanamo Bay in Cuba to ensure they don't return.

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

"We have 30,000 beds in Guantanamo to detain the worst criminal illegal aliens threatening the American people," Mr. Trump said. "Some of them are so bad we don't even trust the countries to hold them, because we don't want them coming back. So we're going to send them out to Guantanamo."