August 27, 2013
The President and Prime Minister Cameron spoke today as part of their ongoing consultations about Syria. The two leaders discussed possible responses by the international community to the indiscriminate use of chemical weapons on August 21 and agreed to stay in close consultation in the coming days.
Barack Obama, Readout of the President's Call with Prime Minister Cameron of the United Kingdom Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/304659