If Donald Trump thought few Americans would care about the deportation of an Arab student protest leader accused of supporting terrorism and antisemitism at an elite university then he was wrong on several counts. Trump accused the student, Mahmoud Khalil, of being “pro-Hamas” and hailed his detention by immigration officers, in front of his pregnant American wife as she waved her husband‘s permanent residence card, as the “first arrest of many to come”. But the disappearance of the Palestinian activist who led protests at Columbia University against Israel’s war in Gaza into the maw of the deportation process has been...