Mamdani, a Democrat, was sworn in as the first Muslim leader of America's biggest city on Thursday, placing his hand on a Qur'an as he took his oath. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.tiktok.com/@cbcnews Subscribe to CBC News on Snapchat: https://bit.ly/3leaWsr Download the CBC News app for iOS: http://apple.co/25mpsUz Download the CBC News