In his new book, NPR Morning Edition host Steve Inskeep told the story of a celebrity politician who rose to power in a time of deep-seated racial divisions, growing anti-immigrant fervor, and historic political discord more than 150 years before Donald Trump.

John Fremont rose to prominence in the 1840s with his many mapping expeditions to the West, which his wife, Jessie, helped him heavily publicize. Inskeep joined Jim Braude Thursday on Greater Boston to talk about Fremont's legacy.