Headlines for April 18, 2024; Meet USC Valedictorian Asna Tabassum: School Cancels Commencement Speech by Pro-Palestinian Student; The New McCarthyism: Congress Grills Columbia Univ. President Amid Crackdown on Pro-Palestine Speech; Columbia Students Risk Arrest, Suspension to Maintain Gaza Solidarity Encampment on Campus; Israel Considers Attacking Iran and Invading Rafah as Netanyahu Seeks Lifelines to Stay in Power