CNN's Harry Enten discusses new poll numbers showing Democratic presidential nominee and Mayor Pete Buttigieg leads with Iowa voters.
CNN's Paula Hancocks reports from Hong Kong where protesters at the Polytechnic University of Hong Kong are locked into a standoff with police. According to a source, protesters are using household products and gasoline to create explosive devices, including a form of napalm.
The head of Iraqi Military Intelligence Lt. Gen. Saad al-Allaq said senior ISIS leaders have taken refuge in Turkey after bribing their way through northern Syria, presenting Europe with a potential security threat.
CNN's Ana Cabrera and National Security Analyst Samantha Vinograd discuss the latest developments in the impeachment inquiry into President Donald Trump.