John Kerry John Kerry

Secretary of State John Kerry spoke with NPR's Steve Inskeep at the State Department. Kerry said if Congress or a future president reverses a nuclear control agreement with Iran, U.S. credibility will suffer. Kainaz Amaria/NPR hide caption

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Kainaz Amaria/NPR

U.S. Will Lose 'All Credibility' If Congress Rejects Nuclear Deal, Kerry Says

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Negotiators' Bonds, Commitment And Devotion To Details Got Iran Deal Done

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Iran, World Powers Reach Deal On Nuclear Program

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U.S. Secretary of State John Kerry speaks at a news conference in Sharm el-Sheikh, Egypt, on Saturday. Kerry said he's returning to nuclear negotiations with Iran with "important gaps" standing in the way of a deal. Brian Snyder/AP hide caption

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Brian Snyder/AP

Senate intelligence committee chairwoman Sen. Dianne Feinstein, D-Calif., is again defending her report on CIA torture methods, which was set to be released this week. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

Egyptian President Abdel-Fattah el-Sissi and U.S. Secretary of State John Kerry talk before a meeting at the Presidential Palace on Sunday in Cairo. Brendan Smialowski/AFP/Getty Images hide caption

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Brendan Smialowski/AFP/Getty Images

Russian Foreign Minister Sergei Lavrov, left, and U.S. Secretary of State John Kerry before their talks Friday in London. Afterward, they reported no breakthroughs on finding a solution to the crisis in Ukraine. Brendan Smialowski/AP hide caption

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Brendan Smialowski/AP

Armed men in unmarked military uniforms — who witnesses believe are Russian troops, but who Russian leaders say are "local self-defense" forces — stand outside the territory of a Ukrainian military unit in the Crimean village of Perevalnoye. Maxim Shipenkov /EPA/Landov hide caption

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Maxim Shipenkov /EPA/Landov