The US government said Wednesday it has located a man wrongly deported to El Salvador and whose whereabouts were previously unknown, adding that he is being held in the country’s CECOT maximum-security prison.

The U.S. has exclusive jurisdiction and responsibility over migrants Trump sent to prison in El Salvador, according to filings at the United Nations

The Trump admin has argued that the men are now outside U.S. legal jurisdiction and no longer protected by constitutional rights.