August 30, 2013
The President spoke with Prime Minister Cameron today as part of their continuing consultations on the Assad regime's use of chemical weapons on August 21, which they agree is unacceptable and cannot be tolerated. As always, the United States values the special relationship with the United Kingdom, a close ally and friend. The President and Prime Minister agreed to continue to consult closely on Syria and the broad range of security challenges that our two countries face together.
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/304666