Internal emails from Boeing reveal employees were raising red flags about the 737 Max as the plane was being developed. Two of the jets later crashed. Kris Van Cleave reports. Source

The administration also said it’s seeking $3.9 million from Southwest Airlines for a different issue. Source

A Fire Department spokesman said the boy was bitten on the head. Source

A new Des Moines Register/CNN/Mediacom poll has Vermont Senator Bernie Sanders leading the race in Iowa 24 days out from Caucus Day Source

Democratic presidential candidates are turning their focus to foreign policy amid rising tensions with Iran. Joe Biden is airing a new ad that touts his work on foreign affairs. Ed O’Keefe reports. Source

When Steve Hartman took a DNA test, he discovered a family he never knew he had. His new relatives showed him the secrets of their family’s past. Source

One employee wrote to another, “Would you put your family on a MAX simulator trained aircraft? I wouldn’t.” The second employee responded, “No.” Source

The president claims Iran’s top general was planning to strike four U.S. embassies before he was killed by an American drone strike. Members of Congress say that’s the first time they’ve heard that. Paula Reid reports. Source

As the Northeast braces for a temperature swing of more than 50 degrees, millions of Americans are under the threat of severe weather. Heavy rain, ice, snow and tornadoes are expected. WCBS chief weathercaster Lonnie Quinn is tracking the forecast. Source

Here’s a look at the top stories making headlines on the “CBS Evening News with Norah O’Donnell.” Source