Border czar calls detained Columbia activist Mahmoud Khalil a 'national security threat'
Authorities have not charged Khalil with a crime and the administration has not provided any evidence showing Khalil's alleged support for the militant group.
Columbia activist Mahmoud Khalil to remain detained in Louisiana as judge weighs bid for release
Columbia graduate student Mahmoud Khalil will remain at a detention center in Louisiana for the near future as a Manhattan ...