DHS revokes visa of one Columbia student, arrests another

The Department of Homeland Security (DHS) announced Friday it has revoked the visa of one Columbia University student and arrested another, escalating its crackdown on students engaged in protests over the conflict in Gaza.The stripping of the visa comes just days after the detention of Mahmoud Khalil, a former grad student at the university, by Immigration and Customs Enforcement (ICE). Khalil has a green card, which can only be revoked by an immigration judge.But Ranjani Srinivasan, a cit