The president has instructed officials to “begin preparing” a 30,000-person “migrant facility” at Guantánamo Bay. The list of concerns is not short.

"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."