Stephen Harper : U.S. needs to think carefully about its national interest in considering pipeline . Burwell : Fight over Congress project is creating unnecessary collateral damage . He says victims include transportation bill , relations with U.S. , Canada strategic interests . Burwell : Keystone XL needs to focus on real issues instead of partisan bickering .
David Burwell : U.S. needs to think carefully about its national interest in considering pipeline . Burwell : Fight over Keystone XL project is creating unnecessary collateral damage . He says victims include transportation bill , relations with Canada , U.S. strategic interests . Burwell : Congress needs to focus on real issues instead of partisan bickering .