Which U.S. president did Niels Bohr meet during his campaign for an open world?

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During his campaign for an "open world," the Danish physicist Niels Bohr met with U.S. President Franklin D. Roosevelt.1

Bohr sought to convince Roosevelt and British Prime Minister Winston Churchill that the development of the atomic bomb necessitated a new approach to international relations, specifically by sharing information about the project with the Soviet Union to prevent a postwar arms race. Unfortunately, he was unable to persuade either leader of his viewpoint.1