Washington

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In this photo provided by the Smithsonian's National Zoo, one of the giant panda cubs is examined by veterinarians after being born at Smithsonian's National Zoo on Saturday, Aug. 22, 2015, in Washington. The National Zoo in Washington says its adult female panda has had twins. (Becky Malinsky/Smithsonian's National Zoo via AP) MANDATORY CREDIT

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In this photo provided by the Smithsonian's National Zoo, one of the giant panda cubs is examined by veterinarians after being born at Smithsonian's National Zoo on Saturday, Aug. 22, 2015, in Washington. The National Zoo in Washington says its adult female panda has had twins. (Pamela Baker-Masson/Smithsonian's National Zoo via AP)

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Patty Murray (Washington)

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Rep. Phil Roe, R-Tenn., questions witnesses during a House Committee on Veterans' Affairs hearing on "Scheduling Manipulation and Veteran Deaths in Phoenix: Examination of the OIG's Final Report" on Capitol Hill in Washington, Wednesday, Sept. 17, 2014. (AP Photo/Manuel Balce Ceneta)

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Senate Majority Leader Mitch McConnell, Kentucky Republican, pauses during a news conference on Capitol Hill in Washington on Aug. 6, 2015, as the Senate began its summer recess. (Associated Press) **FILE**

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Democratic presidential candidate Hillary Rodham Clinton speaks to reporters on Capitol Hill in Washington, Tuesday, July 14, 2015. (Associated Press) **FILE**

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Korean adoptees pose for a photograph on the steps of the Capitol Friday, Sept. 10, 1999, in Washington. More than 400 Korean adoptees gathered for the first time, many of them the abandoned children of U.S. servicemen and Korean women. (AP Photo/Pablo Martinez Monsivais)

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In this Feb. 24, 2015, file photo, Danny Ruthenberg-Marshall, left, with 350 DC, and Lindsey Halvorson, a student at American University, pick up their signs after attending gathering with other opponents of Keystone XL oil pipeline in support of a veto of the legislation outside the White House in Washington. (AP Photo/Jacquelyn Martin, File)

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People wait in line to go into the U.S. Supreme Court in Washington, Monday, June 22, 2015. (AP Photo/Susan Walsh/File)

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Former Attorney General Eric Holder pauses as he speaks at the Justice Department in Washington to discuss the Aug. 9, 2014, shooting in Ferguson, Mo. AP Photo/Carolyn Kaster, File)

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Democratic presidential candidate Sen. Bernard Sanders, I-Vt., speaks at the 2015 International Association of Sheet Metal, Air, Rail, and Transportation Workers (SMART) Conference, Tuesday, July 28, 2015, in Washington. (AP Photo/Jacquelyn Martin)

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President Barack Obama speaks in the South Court Auditorium in the Eisenhower Executive Office Building on the White House complex in Washington, Thursday, Aug. 6, 2015, on the 50th anniversary of the Voting Rights Act. (AP Photo/Carolyn Kaster)

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Members of the U.S. Park Police investigate at the site of a reported shooting near the National Mall in Washington on Tuesday, Aug. 4, 2015. (Associated Press)

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Sen. James Lankford, Oklahoma Republican, leaves a news conference on Capitol Hill in Washington on July 29, 2015, where Planned Parenthood was discussed. (Associated Press)

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Seattle Mayor Ed Murray, left, joined New York Mayor Bill de Blasio, speaks during a news conference with fellow mayors on immigration reform, Friday, Jan. 23, 2015, at the U.S. Conference of Mayors' 83rd Winter Meeting in Washington. (AP Photo/Pablo Martinez Monsivais)