The arrest of a Palestinian activist who helped organize campus protests of the war in Gaza has sparked questions about whether foreign students and green card holders are protected against being deported from the U.S. Mahmoud Khalil was arrested Saturday by Immigration and Customs Enforcement agents.

President Donald Trump is warning that the arrest and possible deportation of a Palestinian activist who helped lead protests at Columbia University will be the first “of many to come” as his administration cracks down on protests against the war in Gaza.

A prominent Palestinian activist who helped lead last spring's protests at Columbia University has been arrested by federal immigration agents.

A new Columbia University disciplinary committee is investigating students who have criticized Israel.