Why Some Key Races Are Too Close To Call; Ukraine Strikes Back on 'Putin's Davos'

Primary results are still trickling in from California, where open primaries have left key races too close to call. Meanwhile, in Iowa, we see signs of President Donald Trump’s grip slipping. NBC News Chief Data Analyst Steve Kornacki explains what the returns mean for major battles in November. Then, NBC News Chief International Correspondent Keir Simmons joins from St. Petersburg, Russia, where hundreds of Ukrainian drones struck targets, including an oil terminal, overnight. He explains how Ukraine was able to penetrate hundreds of miles inside Russian territory.

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