President Barack Obama walks on the South Lawn of the
White House upon his return to Washington April 25, 2010.
REUTERS/Yuri Gripas
President Barack Obama walks on the South Lawn of the
White House upon his return to Washington April 25, 2010.
REUTERS/Yuri Gripas
US President Barack Obama greets acting Nigerian President Goodluck Jonathan before a dinner at the Washington Convention Center during the Nuclear Security Summit in Washington, DC. on April 12. Nigeria and the United States have agreed to work together to counter the spread of nuclear weapons, a senior US official said after a weekend meeting with Jonathan. (AFP/File/Jewel Samad)