Immigration officers arrested a Columbia University graduate for helping lead campus protests against Israel’s treatment of Palestinians. President Trump said the case was “the first arrest of many to come.” Mahmoud Khalil, 30, who graduated in December from Columbia with a master’s degree from its School of International and Public Affairs, was arrested by immigration officers in New York on Saturday and sent to a detention center in Louisiana. Mr. Khalil, who has Palestinian heritage, holds a green card and is married to an American citizen who is eight months pregnant.
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