A determination by Secretary of State Marco Rubio is so far the Trump administration’s sole justification for trying to deport Columbia University student Mahmoud Khalil, according to the first official government document detailing the civil charges he is facing that was obtained by The Washington Post.

Hours before his arrest, Palestinian Columbia student Mahmoud Khalil told Reuters he was concerned that the government was targeting him.

Police officers detain a demonstrator during a protest, following the arrest by US immigration agents of Palestinian student protester Mahmoud Khalil at Columbia University, in New York City, U.S., March 11,