Britain's Prime Minister David Cameron, left, and U.S. President Barack Obama, right, reach out to shake hands during their bilateral meeting on the sidelines of the G-20 summit in Toronto, Saturday, June 26, 2010. (AP Photo/Lefteris Pitarakis)

Photo by: Lefteris Pitarakis

Britain's Prime Minister David Cameron, left, and U.S. President Barack Obama, right, reach out to shake hands during their bilateral meeting on the sidelines of the G-20 summit in Toronto, Saturday, June 26, 2010. (AP Photo/Lefteris Pitarakis)