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In this edition of\\xa0Wilson Center NOW,\\xa0we are joined by Robert J. Lieber, Professor Emeritus of Government and International Affairs at Georgetown University. He discusses his new book, \\u201cIndispensable Nation: American Foreign Policy in a Turbulent World,\\u201d which argues, \\u201cin a world full of revisionist powers, America\\u2019s role is more important than ever.\\u201d