The Department of Homeland Security also announced the arrest of a Palestinian student.
Federal law enforcement had executed a search warrant on Thursday night as part of a separate probe into whether Columbia University harbored undocumented immigrants on its campus.
The official US letter comes after Trump's administration canceled grants and contracts totaling $400 million to Columbia University.
CUAD announced a Friday walkout and protest at Columbia’s gates demanding the reinstatement of students.
The announcement came a week after President Donald Trump's administration announced that it had canceled $400 million in federal grants and contracts.
Don't be fooled by the anti-Israel motte and bailey. They are part of the same defensive system held by a dishonest and radical actor that will not stop until they win.
The protest in the tower's lobby marked the third day of protests since Khalil was arrested by the DHS on Saturday evening.
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