Unrelenting winter storm impacting tens of millions across the U.S.; DOJ releases scathing investigation into Uvalde law enforcement response; Explosion levels building in Washington, D.C.; and more on tonight's broadcast.

Nikki Haley questions Trump's mental competence in lead-up to New Hampshire's primary; Deadly Arctic blast impacts much of the United States; Attack on U.S. military base in Iraq raises concerns of wider conflict in region; and more on tonight's broadcast.