
President Obama visited the TransCanada Stillwater Pipe Yard in Cushing, Okla., in March. Embarking on a second term, he faces mounting pressure on a decision he put off during his re-election campaign: whether to approve the proposed Keystone XL oil pipeline between the U.S. and Canada. (Associated Press)

** FILE ** Work has begun on the Keystone XL Pipeline near Winona, Texas, but whether it will ever carry oil sands from central Canada to Gulf Coast refineries awaits a decision by President Obama. (Tyler [Texas] Morning Telegraph via Associated Press)

Ken Taylor, Canada’s ambassador to Iran during the 1979 hostage crisis, is pleased that Ben Affleck mentioned Canada in his Oscar speech. (Associated Press)

Ken Taylor, Canada’s ambassador to Iran during the 1979 hostage crisis, is pleased that Ben Affleck mentioned Canada in his Oscar speech. (Associated Press)

Canada's national defense minister Peter Gordon MacKay, right, talks with U.S. Secretary of Defense Leon Panetta, at the start of a two-day NATO defense ministers meeting to discuss Syria and Afghanistan, at NATO headquarters in Brussels, Thursday, Feb. 21, 2013. (AP Photo/Yves Logghe)

President Obama returns a salute prior to boarding Air Force One at Andrews Air Force Base, Md., Friday, June 25, 2010, prior to traveling to Canada for the G-20 summit. (AP Photo/Charles Dharapak)

Florida Panthers center Tomas Kopecky (82) of Slovakia, and Washington Capitals defenseman Mike Green (52) of Canada, battle for the puck during the first period of an NHL hockey game, Tuesday, Feb. 12, 2013 in Sunrise, Fla. (AP Photo/Wilfredo Lee)

President Obama visited the TransCanada Stillwater Pipe Yard in Cushing, Okla., in March. Embarking on a second term, he faces mounting pressure on a decision he put off during his re-election campaign: whether to approve the proposed Keystone XL oil pipeline between the U.S. and Canada. (Associated Press)

Sub-Lt. Jeffrey Paul Delisle arrives at Nova Scotia provincial court for a sentencing hearing in Halifax, Canada on Friday, Feb. 1. Delisle, convicted of selling military secrets to Russia, becomes the first person to be sentenced under Canada's Security of Information Act. (Associated Press)