Washington

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A man holds a U.S. and a rainbow flag outside the Supreme Court in Washington on June 26 after the court legalized gay marriage nationwide. (Associated Press)

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White House press secretary Josh Earnest talks to the media during the daily press briefing on July 6, 2015, in Washington. (Associated Press) **FILE**

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Ann Wilson, left, and Nancy Wilson of the band Heart performs at RFK Stadium on Saturday, July 4, 2015, in Washington. (Photo by Nick Wass/Invision/AP)

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LL Cool J performs at RFK Stadium on Saturday, July 4, 2015, in Washington. (Photo by Nick Wass/Invision/AP)

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Buddy Guy performs at RFK Stadium on Saturday, July 4, 2015, in Washington. (Photo by Nick Wass/Invision/AP)

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President Barack Obama, accompanied by first lady Michelle Obama, left, arrives to deliver remarks during an Independence Day celebration on the South Lawn at the White House in Washington, Saturday, July 4, 2015. (AP Photo/Andrew Harnik)

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President Barack Obama, accompanied by first lady Michelle Obama, left, delivers remarks during an Independence Day celebration on the South Lawn at the White House in Washington, Saturday, July 4, 2015. (AP Photo/Andrew Harnik)

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Bruno Mars, left, welcomes President Barack Obama to the stage during an Independence Day celebration on the South Lawn at the White House in Washington, Saturday, July 4, 2015. (AP Photo/Andrew Harnik)

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President Barack Obama, accompanied by first lady Michelle Obama, left, speaks during an Independence Day celebration on the South Lawn at the White House in Washington, Saturday, July 4, 2015. (AP Photo/Andrew Harnik)

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Washington Police Chief Cathy Lanier, left, with Washington Mayor Muriel Bowser, center, and Vice Admiral Dixon Smith, head of Navy Installations Command, speaks to the media during a news conference about the Navy Yard, Thursday, July 2, 2015, in Washington. (AP Photo/Jacquelyn Martin)

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A large police presence gathers along M St. in Southeast Washington, Thursday, July 2, 2015, after an official said shots have been reported in a building on the Washington Navy Yard campus. (AP Photo/Andrew Harnik)

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Sidney Blumenthal, a longtime confidant to former President Bill Clinton and Democratic presidential candidate Hillary Rodham Clinton arrives on Capitol Hill in Washington, Tuesday, June 16, 2015, to face questions from the Republican-led House panel investigating the deadly 2012 attacks in Benghazi, Libya. (AP Photo/Susan Walsh) (Credit)

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Vice President Joe Biden speaks at the 7th US China Strategic and Economic Dialogue (S&ED) and 6th Consultation on People-to-People (CPE) at the U.S. State Department in Washington, Tuesday, June 23, 2015.(AP Photo/Pablo Martinez Monsivais) (credit)

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The crowd celebrates outside of the Supreme Court in Washington, Friday June 26, 2015, after the court declared that same-sex couples have a right to marry anywhere in the US. (AP Photo/Jacquelyn Martin)

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Brazilian President Dilma Rousseff watches as Vice President Joe Biden puts his glass on a table after a toast during a luncheon in her honor, Tuesday, June 30, 2015, at the State Department in Washington. (AP Photo/Manuel Balce Ceneta)

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As the prospect grows that Damascus could fall to the Islamic State or another extremist faction — or some combustible combination of the two — officials say the hope is that Moscow and Tehran might suddenly open to Washington's yearslong attempt to assemble a "moderate opposition" against Syrian strongman Bashar Assad. (Associated Press)