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Nikki Haley, US Ambassador to the United Nations during a UN Security Council meeting on suspected chemical attacks in Douma, Syria. Photo: Atilgan Ozdil/Anadolu Agency/Getty Images
NBC reported on Thursday that two U.S. officials said that blood and urine samples from victims of the chemical attack in Syria over the weekend tested positive for a nerve agent and chlorine gas.
The backdrop: A few hours earlier, Defense Secretary Jim Mattis said that the administration was "looking for the actual evidence" to support a chemical attack, which affected 500 people. Mattis also said there would be a National Security Council meeting at the White House on Thursday to discuss options for response in Syria.