On Monday, U.S. Secretary of State Marco Rubio announced during a visit to El Salvador that Salvadoran President Nayib Bukele has offered to incarcerate criminals deported from the U.S. in the Central American country's CECOT mega-prison.

Under U.S. immigration law, a country such as El Salvador can accept someone deported from the U.S. who isn’t a citizen of that country if the person’s homeland refuses to accept them, says Theresa Cardinal Brown, a former homeland security official under the administrations of Presidents George W. Bush and Barack Obama.