"This vindicates what Mahmoud has maintained since day one — that the government cannot detain or deport him based on Rubio’s say-so," Ramzi Kassem, a lawyer for Khalil and a law professor at the City University of New York, said in a statement.

The Trump administration cannot for now deport or detain Mahmoud Khalil, the Columbia University graduate and pro-Palestinian activist being held in a Louisiana detention center, a federal judge in N...