Palestinian Activist Mahmoud Khalil Returns to Columbia After US Detention

• Palestinian activist Mahmoud Khalil returned to Columbia University after being detained by the US.
• Khalil was at Columbia for an event related to his new memoir, which was attended by around 100 people.
• Jewish alumni expressed outrage and dismay at Khalil's presence at the Ivy League institution.
• Khalil is known for his anti-Israel stance and activism.
• Khalil's memoir event is part of his ongoing book tour.