President Obama is greeted on the tarmac by David Jacobson, the U.S. ambassador to Canada, left, Chief of Protocol Robert William Peck, second from left, and U.S. Consul General Kevin Johnson, right, as he arrives at Pearson International Airport in Toronto, Friday, June 25, 2010, for the G-8 and G-20 Summit. (AP Photo/Carolyn Kaster)

Photo by: Carolyn Kaster

President Obama is greeted on the tarmac by David Jacobson, the U.S. ambassador to Canada, left, Chief of Protocol Robert William Peck, second from left, and U.S. Consul General Kevin Johnson, right, as he arrives at Pearson International Airport in Toronto, Friday, June 25, 2010, for the G-8 and G-20 Summit. (AP Photo/Carolyn Kaster)