Joshua Zeitz says the presidential legacy most at risk under Donald Trump isn’t that of Barack Obama, but of LBJ. I asked him to explain while we discussed his book, “Building The Great Society: Lyndon Johnson’s White House.”

We talked about Johnson’s work on Medicare and Medicaid, how much the Vietnam War detracts from his legacy, how his War On Poverty worked out. I also asked how his work on desegregation and civil rights lost the south for the Democrats and how he spent the political capital he had from his first days in the Oval Office.

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