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Does Donald Trump need to worry about a third-party challenger?

Just as Donald Trump is starting to make up ground in polls against Hillary Clinton, he faces a new problem: third parties.

Republican presidential candidate Donald Trump waves to the crowd as he arrives at a rally at the Anaheim Convention Center on May 25, 2016, in Anaheim, Calif. (Photo by Jae C. Hong/AP)
Republican presidential candidate Donald Trump waves to the crowd as he arrives at a rally at the Anaheim Convention Center on May 25, 2016, in Anaheim, Calif.AP

Benjy Sarlin

Jane Timm