US politics

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. Read more

U.S. Secretary of State John Kerry, center left, speaks with Lithuanian Foreign Minister Linas Linkevicius, center right, during a meeting of the North Atlantic Council in Foreign Ministers Session at NATO headquarters in Brussels on Wednesday, June 25, 2014. The Brussels meeting is the final gathering of high-ranking government officials before the summit of NATO’s leaders scheduled for September in Wales. U.S. Secretary of State John Kerry and his colleagues are expected to fine tune the summit’s agenda on a wide array of topics, from how to redeploy NATO’s forces in response to Russian capabilities and actions to what to do in Afghanistan when NATO’s combat mission in that country comes to an end this December. (AP Photo/Virginia Mayo)

Virginia Mayo/AP

US secretary of state John Kerry, centre left, speaks with Lithuanian foreign minister Linas Linkevicius during a meeting of the North Atlantic Council at Nato headquarters in Brussels on Wednesday Read more

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 Read more

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 Read more

Pope Francis Meets President Obama...VATICAN CITY, VATICAN - MARCH 27:  The silhouette of US President Barack Obama is seen as he arrives in his car at the San Damaso courtyard for a meeting with Pope Francis on March 27, 2014 in Vatican City, Vatican. This is Obama's first audience with Pope Francis and it is the second time that he has been received at the Vatican, after an audience with Pope Benedict XVI on July 10, 2009. Barack Obama is the ninth US President to make an official visit to the Vatican. The first, Woodrow Wilson, received by Pope Benedict XV after the end of the First World War.  (Photo by Franco Origlia/Getty Images)

Franco Origlia/Getty

US President Barack Obama arrives at the San Damaso courtyard for a meeting with Pope Francis in Vatican City, Vatican. This is Mr Obama’s first audience with Pope Francis, and it is the second time he has been received at the Vatican, after an audience with Pope Benedict XVI on July 10 2009. He is the ninth US president to make an official visit to the Vatican. The first, Woodrow Wilson, was received by Pope Benedict XV after the end of World War I.

Federal Reserve Board Governor Tarullo administers the oath of office to new Federal Reserve Board Chairwoman Yellen at the Federal Reserve Board in Washington...Federal Reserve Board Governor Daniel Tarullo (L) administers the oath of office to new Federal Reserve Board Chairwoman Janet Yellen at the Federal Reserve Board in Washington, February 3, 2014.  REUTERS/Jim Bourg    (UNITED STATES - Tags: BUSINESS POLITICS)

Jim Bourg/Reuters

US Federal Reserve board governor Daniel Tarullo (left) administers the oath of office to new board chairwoman Janet Yellen in the Fed’s board room, Washington Read more

President Obama Delivers Economic Address At A Maryland Costco...LANHAM, MD - JANUARY 29:  U.S. President Barack Obama greets supporters, local politicans and store employees after delivering remarks at Costco January 29, 2014 in Lanham, Maryland. Repeating some of the same policy proposals from his State of the Union speech the night before, Obama is beginning a two-day, four-state tour to promote a raise in the minimum wage, immigraiton reform and other other policy ideas.  (Photo by Chip Somodevilla/Getty Images)

Chip Somodevilla/Getty

US President Barack Obama greets supporters, local politicians and store employees after delivering remarks at Costco in Lanham, Maryland on Wednesday. Repeating some of the same policy proposals from his State of the Union speech the night before, Mr Obama is beginning a two-day, four-state tour to promote immigration reform and an increase in minimum wage. Read more

A man holds up a sign as he stands in quiet protest outside the War Memorial building in Trenton...A man holds up a sign as he stands in quiet protest outside the War Memorial building in Trenton, New Jersey January 21, 2014. Governor Chris Christie is being sworn in today for his second term.     REUTERS/Carlo Allegri

Carlo Allegri/Reuters

A man stands in quiet protest outside the War Memorial building in Trenton, New Jersey. Governor Chris Christie is being sworn in today for his second term.

A worker power washes the West Wing of t...A worker power washes the West Wing of the White House January 15, 2014 in Washington, DC. AFP PHOTO/Brendan SMIALOWSKIBRENDAN SMIALOWSKI/AFP/Getty Images

Brendan Smialowski/AFP

A worker power-washes the West Wing of the White House in Washington D.CRead more

U.S. first lady Obama and her daughters Sasha and Malia welcome the official White House Christmas tree at the North Portico of the White House in Washington...U.S. first lady Michelle Obama (R) and her daughters Sasha and Malia welcome the official White House Christmas tree at the North Portico of the White House in Washington November 29, 2013. The 18.5-foot Douglas Fir was grown by Chris Botek, a second generation Christmas tree farmer from Crystal Spring Tree Farm in Lehighton, Pennsylvania.    REUTERS/Jason Reed

Jason Reed/Reuters

Michelle Obama, US first lady, and her daughters Sasha and Malia welcome the official White House Christmas tree to the White House in Washington. The 18.5ft Douglas Fir was grown by Chris Botek, a second-generation Christmas tree farmer from Crystal Spring Tree Farm in Lehighton, Pennsylvania. Read more