CNN By Alisha Ebrahimji and Melissa Alonso, CNN (CNN) — What was supposed to be a time of celebration for Asna Tabassum – the University of Southern California’s 2024 valedictorian – has turned to disappointment after the university denied her the chance to give a speech at commencement over security concerns. “Over the past several Read this story at KIFI , KEYT , KTVZ