Published December 07, 2011, 12:00 AM
Canadian Prime Minister Stephen Harper, left, listens as U.S. President Barack Obama speaks
Canadian Prime Minister Stephen Harper, left, listens as U.S. President Barack Obama speaks following a meeting at the White House in Washington on Wednesday, Dec. 7, 2011. President Obama warned congressional Republicans that he would reject any effort to tie extraneous issues to an extension of the payroll tax cut, including the approval of an oil pipeline between the U.S. and Canada. (AP Photo/The Canadian Press, Paul Chiasson)
Read the article: Obama, Harper won't budge on pipeline dispute
