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.

In exchange for jailing more than 200 deportees, El Salvador’s president, Nayib Bukele, has become a favorite of the Trump administration.

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