President Trump’s decision to send migrants to a Salvadoran prison has set off a national debate in the U.S. In El Salvador, the phenomenon of men disappearing into prisons is all too familiar.

WASHINGTON (Reuters) - U.S. President Donald Trump says he could help return an El Salvadoran man mistakenly deported from Maryland but would not despite court-ordered action, in contrast to his administration's arguments that only El Salvador can act.

The United States proposed sending up to 500 Venezuelan migrants with alleged ties to the Tren de Aragua gang to El Salvador as the two governments sought to reach an agreement on the use of the Central American nation’s notorious mega-prison,