Prisoners spend 23.5 hours a day locked in their cells, with a brief, daily 30-minute window for exercise or religious activities in a central hallway.

After meeting Secretary of State Marco Rubio, El Salvador's president has offered to house U.S. deportees and even American inmates in his country's "mega-prison."

U.S. Secretary of State Marco Rubio on Tuesday called an offer by El Salvador's President Nayib Bukele to house dangerous criminals from the United States in his country's jails "very generous" and said the Trump administration would have to study it.