Mahmoud Khalil's lawyers release footage of his arrest

The video, recorded by his wife Noor Abdalla, who is eight months pregnant, shows immigration agents confronting Khalil and informing him that he is ‘going to be under arrest’ and ordering him to ‘stop resisting’. The agents then handcuff Khalil and take him into a car, refusing to give Abdalla their names when she asks for them. Khalil, a legal US resident and a green card holder, was sent to an immigration detention centre in Louisiana and is being threatened with deportation over his participation in pro-Palestine protests at Columbia University
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Why was Mahmoud Khalil arrested and why is it such a big deal?