August 27, 2013
The President and Prime Minister Harper spoke today by phone to discuss their grave concern about the reported use of chemical weapons by the Syrian regime against civilians near Damascus on Wednesday, August 21. The United States and Canada strongly oppose the use of chemical weapons, and the President and Prime Minister pledged to continue to consult closely on potential responses by the international community.
Barack Obama, Readout of the President's Call with Prime Minister Harper of Canada Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/304782