Journalist Robert Costa is known for his in-depth reporting on former president Donald Trump and for co-authoring a new book with legendary journalist Bob Woodward, but his first claim to fame was convincing John Mayer to play at his high school prom. Robert joined David to talk about his years covering the Republican Party, the ongoing threats he sees to U.S. democracy, what he learned about reporting from Bob Woodward, and their book, Peril.

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