Former President Donald Trump is nervous about the odds his endorsed candidate – Dr. Mehmet Oz – has of winning the Senate GOP primary in Pennsylvania next Tuesday. CNN Political Director David Chalian explains the emergence of a candidate in the race who’s complicating things for Oz and David McCormick, another top primary contender. It’s why party leaders are watching this race closely too.To learn more about how CNN protects listener privacy, visit cnn.com/privacy