Washington

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The words "Never Again" are projected onto the ceiing of a tent during an event marking the 20th anniversary of the United States Holocaust Memorial Museum in Washington, Monday, April 29, 2013. (AP Photo/Charles Dharapak)

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President Barack Obama signs documents in the Oval Office of the White House in Washington, Thursday, Feb. 19, 2015, designating Browns Canyon National Monument in Colorado, a 21,000-acre site along the Arkansas River popular for whitewater rafting a national monument. (AP Photo/Carolyn Kaster)

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President Barack Obama speaks at the Countering Violent Extremism (CVE) Summit, Thursday, Feb. 19, 2015, at the State Department in Washington. The White House is conveying a three-day summit to bring together local, federal, and international leaders to discuss steps the US and its partners can tak(...)

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President Barack Obama speaks at the Countering Violent Extremism (CVE) Summit, Thursday, Feb. 19, 2015, at the State Department in Washington. The White House is conveying a three-day summit to bring together local, federal, and international leaders to discuss steps the US and its partners can tak(...)

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First lady Michelle Obama eats veggie pizza with local school children from Bancroft and Tubman elementary schools after harvesting vegetables for the third annual White House kitchen garden fall harvest, Wednesday, Oct., 5, 2011, at the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama speaks at the White House Summit on Countering Violent Extremism, Wednesday, Feb. 18, 2015, in the South Court Auditorium of the Eisenhower Executive Office Building on the White House Complex in Washington. (AP Photo/Jacquelyn Martin)

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Washington National Cathedral Director of Preservation and Facilities Jim Shepherd talks about repairs and cleaning of the stonework in the ceiling at the Washington National Cathedral in Washington, Wednesday.

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FILE - In this Sunday, Dec. 28, 2014 file photo, Washington Redskins quarterback Robert Griffin III (10) passes the ball during the first half of an NFL football game against the Dallas Cowboys in Landover, Md. Former Redskins head coach Mike Shanahan says things went downhill for him in Washington because Robert Griffin III and team owner Dan Snyder both wanted the quarterback to become a dropback passer, Wednesday, Feb. 18, 2015. (AP Photo/Richard Lipski, File)

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President Barack Obama speaks at the White House Summit on Countering Violent Extremism, Wednesday, Feb. 18, 2015, in the South Court Auditorium of the Eisenhower Executive Office Building on the White House Complex in Washington. (AP Photo/Jacquelyn Martin)

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President Barack Obama meets with Secretary of Defense Ash Carter in the Oval Office of the White House, Tuesday, Feb. 17, 2015, in Washington. (AP Photo/Jacquelyn Martin)

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Washington Wizards guard John Wall (2) dunks the ball in front of Brooklyn Nets guard Alan Anderson (6) in the first half of an NBA basketball game Saturday, Feb. 7, 2015, in Washington. (AP Photo/Alex Brandon)

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Washington Wizards forward Paul Pierce (34) walks on the court in the first half of an NBA basketball game against the Brooklyn Nets, Saturday, Feb. 7, 2015, in Washington. (AP Photo/Alex Brandon) Washington Wizards forward Paul Pierce (34) walks on the court in the first half of an NBA basketball game against the Brooklyn Nets, Saturday, Feb. 7, 2015, in Washington. (AP Photo/Alex Brandon)

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A plow removes snow from the White House driveway after a winter storm, on Tuesday, Feb. 17, 2015, in Washington. The season's first major snow storm to blast large parts of the South dropped up to 8 inches of snow around the Washington area. (AP Photo/Evan Vucci)

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In this Feb. 11, 2015, file photo, President Barack Obama, flanked by Vice President Joe Biden, left, and Secretary of State John Kerry, right, speaks about the Islamic State group in the Roosevelt Room of the White House in Washington. (AP Photo/Jacquelyn Martin, File)