12/23/2018: To Catch a Spy, Malta, The Wolves of Yellowstone

Last year, a former CIA officer was caught committing espionage. Anderson Cooper hears from the officials who caught him. Bill Whitaker reports from Yellowstone Park -- where tourists flock to catch a glimpse of the wolves that roam the land. And -- Is there something rotten in Malta? Jon Wertheim finds out on tonight's "60 Minutes." Learn more about your ad choices. Visit megaphone.fm/adchoices

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