What Does ‘Let's Go Brandon' Mean, and What's Biden Got to Do With It?

During a NASCAR postrace interview with driver Brandon Brown, the crowd started jeering at President Joe Biden using profanity. Now the phrase "Let's Go Brandon," based on a misheard version of their chant, is popular in conservative circles. The phrase is a form of criticism but also a signal to other people who understand it, NBC News reporter Allan Smith explains.