President Trump says the arrest of Mahmoud Khalil is the first of many in the administration’s campaign to dismantle what it calls extreme leftist ideology on U.S. campuses.

The arrest of a Palestinian graduate student who represented anti-Israel protests at Columbia University marks a significant shift for the U.S. government, even from an administration that has prioritized cracking down on both immigration and campus anti-war protests.

The arrest of a Columbia University graduate student and activist over the weekend has put a spotlight on First Amendment and immigration rights.