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 Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday May 13, 2015 in north Philadelphia, Pennsylvania. At least six people were killed and more than 200 others were injured in the crash

Win McNamee/Getty Images

Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday on Wednesday in north Philadelphia, Pennsylvania

US President Barack Obama and Japanese Prime Minister Shinzo Abe attend official welcoming ceremonies on the South Lawn of the White House in Washington, DC, April 28, 2015.

Mandel Ngan/AFP

US President Barack Obama and Japanese Prime Minister Shinzo Abe attend official welcoming ceremonies on the South Lawn of the White House in Washington, DC on Tuesday

President Obama Signs Memorandum of Disapproval...epa04687827 US President Barack Obama smiles after signing a memorandum of disapproval regarding S.J. Res. 8, a Joint Resolution providing for congressional disapproval of the rule submitted by the National Labor Relations Board relating to representation case procedures, in the Oval Office of the White House in Washington, DC, USA, 31 March 2015.  EPA/JIM LO SCALZO

Jim Lo Scalzo/EPA

US President Barack Obama smiles after signing a memorandum of disapproval regarding S.J. Res. 8, a Joint Resolution providing for congressional disapproval of the rule submitted by the National Labor Relations Board relating to representation case procedures, in the Oval Office of the White House in Washington 

Police remove a protester holding a sign as U.S. Secretary of State John Kerry testifies at a Senate Foreign Relations Committee hearing on Capitol Hill in Washington...Police remove a protester holding a sign as U.S. Secretary of State John Kerry testifies at a Senate Foreign Relations Committee hearing on "The President's Request for Authorization to Use Force Against ISIS: Military and Diplomatic Efforts" on Capitol Hill in Washington March 11, 2015.

Kevin Lamarque/Reuters

Police remove a protester holding a sign as US Secretary of State John Kerry testifies at a Senate Foreign Relations Committee hearing on “The President’s Request for Authorisation to Use Force Against Isis: Military and Diplomatic Efforts” on Capitol Hill in Washington on Wednesday

Anti-Zionist ultra-orthodox Jews of the Naturei Karta movement hold signs outside the Washington Convention Center where Israeli Prime Minister Benjamin Netanyahu addressed the American Israel Public Affairs Committee (AIPAC) policy conference inb Washington, DC, on March 2, 2015. Netanyahu is ramping up his mission to foil an emerging White House-backed nuclear deal with Iran with the speech to the powerful pro-Israel AIPAC lobby.

Nicholas Kamm/AFP

Anti-Zionist ultra-orthodox Jews of the Naturei Karta movement hold signs outside the Washington Convention Centre where Israeli Prime Minister Benjamin Netanyahu addressed the American Israel Public Affairs Committee (AIPAC) policy conference in Washington, DC, on Monday

An ice covered statue is seen in Lafayette Square March 2, 2015 in Washington, DC.

Brendan Smialowski/AFP

An ice covered statue is seen in Lafayette Square on Monday in Washington, DC

Protesters listen during a hearing of the Senate Armed Services Committee on Capitol Hill on February 5, 2015 in Washington, DC. Witnesses testified about the use of the Guantanamo Detention Facility in Cuba and US detention policy.

Brendan Smialowski/AFP

Protesters listen during a hearing of the Senate Armed Services Committee on Capitol Hill on Thursday in Washington, DC. Witnesses testified about the use of the Guantanamo Detention Facility in Cuba and US detention policy

The official White House Christmas tree, from the Crystal Spring Tree Farm in Pennsylvania, sits next to the North Portico of the White House in Washington...The official White House Christmas tree, from the Crystal Spring Tree Farm in Pennsylvania, sits next to the North Portico of the White House in Washington, November 28, 2014.

Larry Downing/Reuters

The official White House Christmas tree, from the Crystal Spring Tree Farm in Pennsylvania, sits next to the North Portico of the White House in Washington on Friday

Tyler Lewis practices Parkour as the sun sets over the downtown area of Seattle, Washington.  Parkour which originated from France in the 1980's was developed as a military obstacle course training and is becoming a recognized sport with competitions and events around the world.

Mark Ralston/AFP

Tyler Lewis practises Parkour in downtown Seattle, Washington. Parkour originated in France in the 1980s as military obstacle course training and has now become a recognised sport

Scaffolding surrounds the U.S. Capitol Building while it undergoes repairs in Washington, D.C., U.S., on Wednesday, Nov. 5, 2014. Republicans roared back in the midterm elections on Tuesday, capturing control of the Senate from Democrats, winning crucial governor races and solidifying their majority in the U.S. House.

Andrew Harrer/Bloomberg

Scaffolding surrounds the U.S. Capitol Building while it undergoes repairs in Washington, D.C., U.S., on Wednesday. Republicans roared back in the midterm elections on Tuesday night, capturing control of the Senate from the Democrats

U.S. President Barack Obama and former President Bill Clinton walk past the Rose Garden to host an event marking the 20th anniversary of the national service program AmeriCorps at the White House in Washington September 12, 2014. In 1993, Clinton signed the bill that created AmeriCorps.

Kevin Lamarque/Reuters

U.S. President Barack Obama and former President Bill Clinton walk past the Rose Garden to host an event marking the 20th anniversary of the national service program AmeriCorps at the White House in Washington

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and others, stand on the South Lawn of the White House in Washington, Thursday, Sept. 11, 2014, as they observe a moment of silence to mark the 13th anniversary of the 9/11 attacks.

Charles Dharapak/AP

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and others, stand on the South Lawn of the White House in Washington on Thursday, as they observe a moment of silence to mark the 13th anniversary of the 9/11 attacks

Fed Chair Janet Yellen Gives Semiannual Monetary Policy Report To Senate Committee...WASHINGTON, DC - JULY 15:  Federal Reserve Board Chairwoman Janet Yellen arrives for testimony before the Senate Banking, Housing and Urban Affairs Committee July 15, 2014 in Washington, DC. Yellin delivered her "Semiannual Monetary Policy Report to the Congress."  (Photo by Win McNamee/Getty Images)

Win McNamee/Getty

US Federal Reserve chairwoman Janet Yellen arrives for testimony before the Senate Banking, Housing and Urban Affairs Committee in Washington, DC. Ms Yellin delivered her semi-annual monetary policy report to Congress. 

A protester dressed as a copy of the Bible joins groups demonstrating outside the U.S. Supreme Court in Washington June 30, 2014. The U.S. Supreme Court on Monday ruled that business owners can object on religious grounds to a provision of U.S. President Barack Obama's healthcare law that requires closely held companies to provide health insurance that covers birth control.

Jonathan Ernst/Reuters

A protester dressed as a copy of the Bible joins groups demonstrating outside the US Supreme Court in Washington. The court on Monday ruled that business owners could object on religious grounds to a provision of President Barack Obama’s healthcare law that requires closely held companies to provide health insurance that covers birth control

William Temple, from the Golden Isle Tea Party in Brunswick sits in the audience at the 5th annual Faith & Freedom Coalition's "Road to Majority" Policy Conference in Washington...William Temple, from the Golden Isle Tea Party in Brunswick, GA, sits in the audience at the beginning of the second day at the 5th annual Faith & Freedom Coalition's "Road to Majority" Policy Conference in Washington June 20, 2014. REUTERS/Larry Downing

Larry Downing/Reuters

William Temple, from the Golden Isle Tea Party in Brunswick, GA, sits in the audience at the beginning of the second day at the 5th annual Faith & Freedom Coalition’s “Road to Majority” Policy Conference in Washington 

Obama Welcomes World Series Champions Boston Red Sox To The White House...WASHINGTON, DC - APRIL 01:  Boston Red Sox designated hitter David Ortiz (L) poses for a "selfie" with U.S. President Barack Obama during a ceremony on the South Lawn of the White House to honor the 2013 World Series Champion Boston Red Sox April 1, 2014 in Washington, DC. The Red Sox defeated the St. Louis Cardinals in the 2013 World Series. (Photo by Win McNamee/Getty Images)

Win McNamee/Getty

Boston Red Sox designated hitter David Ortiz poses for a selfie with US President Barack Obama during a ceremony at the White House to honour the 2013 World Series Champions 

Homeless people bundle up at the McPherson Square Metrorail stop near the White House after the region was pounded with snow overnight around Washington...Homeless people bundle up at the McPherson Square Metrorail stop near the White House after the region was pounded with snow overnight around Washington, February 13, 2014.    REUTERS/Larry Downing

Larry Downing/Reuters

Homeless people bundle up at the McPherson Square Metro station near the White House in Washington to escape the snow

US President Barack Obama attends the National Prayer Breakfast in Washington, DC, on February 6, 2014.

Jewel Samad/AFP

US President Barack Obama endorses the National Day of Prayer by attending the celebratory breakfast in Washington, DC, on Thursday

Bao Bao...Bao Bao, the four and a half month old giant panda, makes her public debut at an indoor habitat at the National Zoo in Washington, Monday, Jan. 6, 2014. Bao Bao, who now weighs 16.9 pounds (7.65 kilograms), was born to the zoo's female giant panda Mei Xiang and male giant panda Tian Tian.

Charles Dharapak/AP

Bao Bao, the four-month-old giant panda, makes her public debut at an indoor habitat at the National Zoo in Washington DC, US. She weighs 7.65kg and was born to the zoo’s female giant panda Mei Xiang and male Tian Tian. 

National Park Service workers spread salt on icy steps of the Lincoln Memorial in Washington...National Park Service workers spread salt on the icy steps of the Lincoln Memorial in Washington January 3, 2014. A heavy snowstorm and dangerously cold conditions gripped the northeastern United States on Friday, delaying flights, paralyzing road travel and closing schools and government offices across the region.  REUTERS/Gary Cameron

Gary Cameron /Reuters

National Park Service workers spread salt on the icy steps of the Lincoln Memorial in Washington. A heavy snowstorm and dangerously cold conditions gripped the northeastern United States on Friday.