Donald Trump has been fixated on the trade deficit recently. He keeps bringing it up to rationalize the sweeping tariffs he wants to impose on basically the entire world. But does the president even understand what it actually is? A trade deficit isn’t inherently a bad thing. It doesn’t necessarily mean that America is being “ripped off,” as Trump has suggested before. It’s an important concept to understand so let Ali Velshi explain what it actually is instead of what Trump wants you to think it is.