Victor Oquendo reports on the historic snowstorm slamming the South, shutting down airports, canceling thousands of flights, and for the first time ever, blizzard warnings were issued for parts of Texas and Louisiana with snow blanketing New Orleans' famous Bourbon Street, and Ginger Zee tracks the dangerously cold blast that's put more than 200 million from Texas to Maine on alert; Rachel Scott has new reaction to Pres. Trump's sweeping pardons for Jan. 6 rioters, including from a police officer who was assaulted as the president defends his action; Britt Clennett has tragic details on the desperate escape from the inferno that roared through a popular ski resort overseas, killing dozens, with some people tying bed sheets to escape from windows; and more on tonight's broadcast of World News Tonight with David Muir.

Mary Bruce reports on a federal judge temporarily blocking Pres. Trump's executive order ending the constitutional guarantee of birthright citizenship, calling it "blatantly unconstitutional;" Pierre Thomas has the latest on Capitol Police acknowledging a stunning security failure after they say a 27-year-old Massachusetts man touring the U.S. Capitol passed through security with a 9mm loaded handgun while confirmation hearings were underway; Mireya Villarreal has the latest on the seven police officers in San Antonio, Texas, that were shot during a standoff with a Navy veteran while responding to an attempted suicide call; and more on tonight's broadcast of World News Tonight with David Muir.