As Zohran Mamdani takes over as New York City's first Muslim-East Asian mayor, are Democrats ready to embrace his Democratic Socialist platform. We explore what his ascent could mean for the party's efforts to win back Congress. 

Also on today's show: The urgent search for survivors after a deadly New Year's Eve inferno ... President Trump orders the National Guard out of three cities but says they could return even stronger ... Venezuela detains several Americans as the US builds its pressure campaign.