Mahmoud Khalil, a prominent Palestinian activist who helped lead Columbia University’s student protest movement demanding a ceasefire in Gaza, was arrested Saturday night by federal immigration authorities,

Demonstrators plan to rally in New York City on Monday to demand the release of Mahmoud Khalil, a Palestinian activist and Columbia University graduate arrested by federal immigration agents — a detainment that President Donald Trump said was the "first arrest of many to come.

Agents told Mahmoud Khalil’s attorney that they were revoking Khalil’s green card. He is legally considered a permanent resident.