US Secretary of State Marco Rubio stated that the arrest of an anti-Israel activist from Columbia University is not about free speech but about individuals who do not have the right to be in the United States. The activist, Mahmoud Khalil, was arrested by US immigration officials and his deportation has been temporarily blocked by a judge. Khalil's lawyers claim that his student visa and green card were revoked. The Department of Homeland Security has accused Khalil of leading activities aligned with Hamas. The arrest has been seen as part of the US administration's crackdown on pro-terrorist and anti-Semitic activities on college campuses.