First public hearing in impeachment inquiry into President Trump, record-breaking cold blast grips over 200 million across the country, and test reveals toxic content found in vapor from illicit THC cartridges.

Watch “NBC Nightly News With Lester Holt” at 6:30 p.m. ET / 5:30 p.m. CT (or check your local listings).

1:33 Key Witness Testify In First Public Impeachment Hearing

2:34 Taylor: Trump Asked About 'Investigations' On Newly-Revealed Call

3:10 Diplomats Tie Trump To Campaign To Pressure Ukraine

5:38 Republicans Blast Impeachment Hearings And Defend Trump

7:07 Impeachment Witnesses Deny Being 'Never Trumpers'

7:22 Second Public Impeachment Hearings Set For Friday

7:51 Trump Slams Impeachment Hearing As 'Joke' And 'Sham'

9:06 Trump Welcomes Turkey's Leader For Controversial Visit

9:26 White House Reacts To First Public Impeachment Hearing

9:52 Key Witnesses Testify In First Public Impeachment Hearing

11:15 Deep Freeze Across U.S. Blamed For At Least Nine Deaths

12:37 Hero Firefighter Dies Trying To Save Baby From Inferno

13:58 Venice's Worst Floods In 50 Years Prompt State Of Emergency

14:35 Tests Show Black Market Marijuana Vapes Tainted By Toxins

17:31 School Employees Charged In Death Of Student With Autism

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