Olympic swimmer Michael Phelps captured his 23rd gold medal in Rio on Saturday. He has tallied 28 medals overall, the most of any athlete of any sport in history, in a career that has spanned four Olympic competitions, but Phelps has said the Rio Olympics will be his last. New York Times reporter Karen Crouse joins Williams Brangham from Rio.
Michael Phelps nears retirement after record-breaking career
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