Senators John McCain, left, and Lindsey Graham in Cairo on Aug. 6, after they met with military leaders.Credit...Amr Nabil/Associated Press CAIRO — For a moment, at least, American and European diplomats trying to defuse the volatile standoff in Egypt thought they had a breakthrough. As thousands of Islamist supporters of the ousted president, Mohamed Morsi, braced for a crackdown by the military-
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