The Trump administration delivered an ultimatum to leaders of Columbia University: Make a series of major changes or lose out on billions in federal aid.

U.S. Secretary of Homeland Security Kristi Noem said when you advocate for violence and terrorism, that privilege should be revoked, and you should not be in this country.

A letter outlining “immediate next steps” arrived less than a week after the administration said it was canceling $400 million in grants and contracts.