An Israeli associate of Mohsen Mahdawi, the Columbia University student detained Monday by U.S. Immigration and Customs Enforcement, said his targeting is a clear sign that no kind of activism in support of Palestine — even efforts to build peace with Israelis — is the right kind of activism for the Israeli and American right. Mahdawi’s green card was revoked by Secretary of State Marco Rubio under an obscure provision of immigration law that allows the deportation of people deemed to be a threat to U.S. foreign policy. In Mahdawi’s case, according to the New York Times, Rubio said without...