The report undercuts months of assertions by senior Trump officials, who have repeatedly claimed they have no power to compel the return of these individuals.

Over 200 migrants who were sent to a Salvadoran prison under accusations they were gang members are the responsibility of the U.S., El Salvador officials told the U.N.

El Salvador has said that the United States has legal jurisdiction over deported migrants being held in the Central American country, court documents show.In mid-March, Trump sent 238 Venezuelans and 23 Salvadorans from the United States to the CECOT prison in El Salvador.