U.S. conducts airstrikes against Iranian-backed militias in retaliation for attack on Erbil Air Base; Israel warns war with Hamas will go on for many more months; Thousands of migrants join caravan in Central America headed for U.S.; and more on tonight's broadcast.

Severe weather from coast-to-coast could impact New Years travel; IDF says it ‘regrets' harming uninvolved Gazans amid strike on refugee camp; Nikki Haley attempts to recover after Civil War comments receive backlash; and more on tonight's broadcast.