"This is the first arrest of many to come," the president said of Mahmoud Khalil, a green card holder abducted by immigration agents and sent to Louisiana.

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,

Khalil, a Palestinian activist who was involved in Columbia University's protests last year, has been detained by ICE.