Our guest this week is a celebrated historian and the award-winning author, co-author or editor of more than 30 books. Most of these works are focused on American presidents or people we know because of presidents.

Douglas Brinkley is the Katherine Tsanoff Brown Chair in Humanities and Professor of History at Rice University, a CNN Presidential Historian, and a contributing editor at Vanity Fair.

Katie and Joe talk to Professor Brinkley about the power and consequences of a president's words.

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Presidential Historian Douglas Brinkley