UPDATED: Plane crash investigation, the debate over visas, mortgage rates on the rise & more

A US official tells CNN that Russian air defenses may have misidentified an Azerbaijan Airlines jet that crashed on Christmas day. Disagreement about visas for highly skilled workers signals discord among some of President-elect Donald Trump’s supporters. NATO is going to boost its presence in the Baltic Sea after potential sabotage. The average 30-year fixed mortgage rate is ending the year higher than it was at the start. Plus, bird poop could play a crucial role in predicting the next pandemic. Learn more about your ad choices. Visit podcastchoices.com/adchoices