CNN  —  Detained for more than 100 days without charge, and with the threat of deportation looming over him, Palestinian student activist Mahmoud Khalil was convinced he would eventually prevail. In an interview with CNN’s Christiane Amanpour, Khalil, who is now back with his young family, describes the months languishing in a United States Immigration and Customs Enforcement detention center, and the pain of being denied permission to be present at his son’s birth. “It was a very, very