President Jimmy Carter's national security adviser, Zbigniew Brzezinski, has died at the age of 89. Walter Russell Mead speaks about Brzezinski's influence on U.S. foreign policy.

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Walter Russell Mead on PBS News Hour
President Jimmy Carter's national security adviser, Zbigniew Brzezinski, has died at the age of 89. Walter Russell Mead speaks about Brzezinski's influence on U.S. foreign policy.