Last week, Donald Trump announced that Guantanamo Bay would be used to house the “worst criminal illegal aliens” and claimed that it would be drastically scaled up to hold as many as 30,000 people. In addition to its infamous role in the War on Terror, it’s the latest use of Gitmo as an immigration deterrent—and legal grey zone.Guest: Andrea Pitzer, author of One Long Night: A Global History of Concentration Camps. Want more What Next? Join Slate Plus to unlock full, ad-free access to What Next and all your other favorite Slate podcasts. You can subscribe directly from the What Next show page on Apple Podcasts and Spotify. Or, visit slate.com/whatnextplus to get access wherever you listen.Podcast production by Elena Schwartz, Paige Osburn, Anna Phillips, Madeline Ducharme and Rob Gunther. Learn more about your ad choices. Visit megaphone.fm/adchoices