What are your thoughts on the detainment of Mahmoud Khalil?

Khalil is a student at Columbia University who was arrested yesterday by ICE for protesting against Israel. He is in the U.S. legally with a green card, which the state department is revoking, apparently for his role in these protests. His family and lawyers do not know where he is being held.

Your thoughts on this?

Editing for clarity - specifically interested in your thoughts on ICE moving to deport a lawful resident for protest and not telling his family and lawyers where he is, not the substance of the protest. Thank you!

Editing again because I pasted the same link twice. My bad.