On the 75th anniversary of the murder of George Polk, CBS News White House correspondent Steven Portnoy begins the network’s first dive into the case in decades. The first 20 minutes of Part 1 of this CBS News Radio special is available now as a sneak preview. The full program airs on radio stations and SiriusXM’s P.O.T.U.S. Channel 124 over Memorial Day weekend and will post online on Friday (5/26) at cbsnews.com/polk.

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