Donald Trump says he will use a detention center at Guantánamo Bay to hold tens of thousands of criminal immigrants in the U.S. illegally.

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

In his first interview since being sworn in as defense secretary, Pete Hegseth sought to clarify how the federal government plans to use Guantánamo Bay to detain migrants being deported from the United States.