Activist and Columbia University graduate Mahmoud Khalil is speaking out through an op-ed published in the campus newspaper "Columbia Spectator."

Columbia University student Mahmoud Khalil is being held in an immigration detention facility in Louisiana more than a thousand miles away from where the 30-year-old was arrested in New York in early March. Here’s what to know about the Central Louisiana ICE Processing Center, where he’s being detained while he fights to stay in the U.S.