The Department of Homeland Security is threatening to remove Harvard University‘s ability to enroll foreign students if it does not give the agency information about its “foreign student visa holders’ illegal and violent activities.”

Homeland Security Secretary Kristi Noem sent a letter to Harvard officials warning that if the school did not send over the requested records by April 30, it would lose its Student and Exchange Visitor Program certification. The department also announced it had canceled two DHS grants totaling $2.7 million in a news release Wednesday.