A New York federal judge is set to hear pivotal questions in the case of Mahmoud Khalil, a leader of large Gaza solidarity protests at Columbia University who now faces deportation after his arrest by Immigration and Customs Enforcement agents.

The arrest of Mahmoud Khalil​, a former Columbia University student and pro-Palestinian protester, is raising questions about the rights of green card holders.

A legal scholar explains the unusual justification for the Columbia graduate’s arrest, and what it could augur for immigration enforcement in Trump’s second term.