Mahmoud Khalil, a permanent US resident, is facing deportation via a rarely used foreign policy law. He is a Palestinian student who has been organising along with fellow pro-Palestinian supporters. Mahmoud has US residency via a green card which are rarely revoked without a criminal conviction. Khalil has no such criminal conviction and is instead facing deportation regardless because the US government:

has reasonable ground to believe that your presence or activities in the United States would have potentially serious adverse foreign policy consequences for the United States.