Over 200 migrants who were sent to El Salvador's CECOT mega-prison under accusations that they were members of a violent criminal gang are the responsibility of the United States, the government of El Salvador told a United Nations working group.

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.

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.