Immigration agents with the Department of Homeland Security have detained a leader of the Gaza solidarity encampment at Columbia University in New York. Mahmoud Khalil, who is an Algerian citizen of Palestinian descent, is a green card holder and is married to a U.S. citizen; his wife is eight months pregnant. Immigration officials told Khalil's lawyer his green card was being revoked. Khalil recently graduated from Columbia University's School of International and Public Affairs, and his whereabouts are unknown.

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