An “administrative error” that led to a Maryland man being deported to a brutal prison in El Salvador as part of Donald Trump’s immigration policy has thrust Kilmar Armando Abrego Garcia into the national spotlight.

U.S. officials have argued in court records that the United States is powerless to effectuate his return because he is now in Salvadoran custody, and that Kilmar Abrego García’s lawyers have “not clearly shown” that he would face harm in the prison.