ON THE LAST DAY of April, a federal judge ordered the release of Mohsen Mahdawi, a senior at Columbia University, from Immigration custody in Vermont. Mahdawi, a legal permanent resident for ten years, had been arrested during a citizenship interview on April 14 and spent more than two weeks in Northwest State Correctional Facility in St. Albans. Born in a refugee camp in the West Bank, Mahdawi participated in protests against Israel’s brutal war in Gaza last year; as with fellow Columbia student Mahmoud Khalil, the government is seeking to deport him on grounds that he poses a national-security threat. Outside the courthouse, Mahdawi, who appeared poised with impeccable hair, wire-rimmed glasses, and a keffiyeh, addressed a gathered crowd: “I am saying it clear and loud to President Trump and…