A migrant from Venezuela deported by the Trump administration to El Salvador has taken the first step toward suing the U.S. government, saying he was wrongly sent to a notorious prison in the Central American country where he was beaten by guards and kept from contacting his family or an attorney.

Venezuelan migrants imprisoned for months in El Salvador under a U.S. immigration crackdown have reunited with their families

For months, they say, they were beaten by prison guards, shot with pellets, deprived of adequate medical care and denied any due process inside El Salvador’s Center for Terrorism Confinement.