New details deepen questions about the deportations, showing that El Salvador’s president pressed for assurances that the migrants were really members of the Tren de Aragua gang.

The New York Times pieced together the most complete account yet of the U.S. arrangement with El Salvador and the March 15 deportations from internal government documents, court filings and interviews with 22 people familiar with the operation or legal challenges, many of whom spoke on the condition of anonymity to avoid retaliation.

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