Washington

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President Barack Obama meets with Italian Prime Minister Matteo Renzi in the Oval Office of the White House in Washington, Friday, April 17, 2015. The leaders are expected to discuss Europe's economy, a pending trade pact between the U.S. and Europe, climate change and energy security.(AP Photo/Susan Walsh)

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President Obama speaks to the media before signing the bill H.R. 2 Medicare Access and CHIP Reauthorization Act of 2015 in the Rose Garden of the White House in Washington, Thursday, April 16, 2015. (Associated Press)

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President Obama pauses as he speaks in the South Court Auditorium of the Eisenhower Executive Office Building on the White House complex in Washington, Thursday, April 16, 2015, during a Champions of Change event highlighting issues important to working families. (AP Photo/Carolyn Kaster) ** FILE **

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Vice President Joe Biden talks with Iraq's Prime Minister Haider Al-Abadi during a session of the U.S.-Iraq Higher Coordinating Committee, Thursday, April 16, 2015, in the Indian Treaty Room of the Eisenhower Executive Office Building on the White House complex in Washington. (AP Photo/Susan Walsh) ** FILE **

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Members of Congress join House Speaker John Boehner of Ohio, right, as he speaks on Capitol Hill in Washington, Thursday, April 16, 2015, before signing a bipartisan bill which blocks a cut in Medicare payments that was due to take effect this month, and it revamps how physicians will be paid in the future. (AP Photo/Andrew Harnik)

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A member of a bomb squad checks a small helicopter after a man landed on the West Lawn of the Capitol in Washington, Wednesday, April 15, 2015. (AP Photo/Manuel Balce Ceneta)

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Passengers wait on the platform before boarding a train at the U Street Metro Station in Washington. (Associated Press)

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Washington Capitals left wing Alex Ovechkin (8), from Russia, shoots past New York Islanders defenseman Brian Strait (37) during the first period of Game 1 of a first-round NHL hockey Stanley Cup playoffs series, Wednesday, April 15, 2015, in Washington. (AP Photo/Alex Brandon)

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New York Islanders defenseman Brian Strait (37) shoves Washington Capitals left wing Jason Chimera (25) to the ice during the first period of Game 1 of a first-round NHL hockey Stanley Cup playoffs series, Wednesday, April 15, 2015, in Washington. (AP Photo/Alex Brandon)

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Internal Revenue Service (IRS) Commissioner John Koskinen testifies on Capitol Hill in Washington, Wednesday, April 15, 2015, before the Senate Homeland Security and Governmental Affairs Committee hearing to examine IRS challenges in implementing the Affordable Care Act. (AP Photo/Andrew Harnik) ** FILE **

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"Ferguson," A play based entirely on Grand Jury testimony surrounding the shooting death of Michael Brown, debuts in Washington on Wednesday. (Phelim McAleer)

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Senate Minority Leader Harry Reid of Nevada pauses during a news conference on Capitol Hill in Washington, Tuesday, April 14, 2015, following a Senate policy luncheon. (AP Photo/Manuel Balce Ceneta)

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Vice President Joe Biden speaks to the University of Notre Dame Leaders Symposium, Tuesday, April 14, 2015, at the Ritz Carlton in Washington. (AP Photo/Molly Riley)

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House Majority Leader Kevin McCarthy of Calif. participates in a news conference on Capitol Hill in Washington on March 24, 2015, with members of the House GOP leadership. (Associated Press) **FILE**

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House Majority Leader Kevin McCarthy of California speaks during a news conference on Capitol Hill in Washington on March 24, 2015. (Associated Press) **FILE**

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In this Dec. 3, 2014 file photo, former Secretary of State Hillary Rodham Clinton speaks in Gaston Hall at Georgetown University, in Washington. (AP Photo/Carolyn Kaster, File)

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Atlanta Hawks guard Kent Bazemore (24) looks to pass between Washington Wizards guard John Wall, left, and Washington Wizards forward Paul Pierce (34) in the first half of an NBA basketball game Sunday, April 12, 2015, in Washington. (AP Photo/Alex Brandon)