How Replacement Theory Moved From The Fringe To The Mainstream

The suspected gunman in Saturday's shooting in Buffalo, N.Y. is alleged to have written a racist screed explaining his motivations. One of the topics discussed is "replacement theory," a talking point that has made its way to statements made by Republican lawmakers and Fox News hosts despite its past as a fringe idea in racist forums. Today, a look at what replacement theory is, how it became amplified & what implications that has on the political process. This episode: White House correspondent Tamara Keith, national political correspondent Mara Liasson and national security correspondent Odette Yousef.