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US Army Lieutenant General H.R. McMaster looks on as US President Donald Trump announces him as his national security adviser at his Mar-a-Lago resort in Palm Beach, Florida, on February 20, 2017. / AFP / NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US Army Lieutenant General H.R. McMaster looks on as US President Donald Trump announces him as his national security adviser at his Mar-a-Lago resort in Palm Beach, Florida, on February 20, 2017. / AFP / NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

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    McMaster: Ask Russia about chemical weapons

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McMaster: Ask Russia about chemical weapons

President Trump's National Security Adviser H.R. McMaster says the U.S. should ask Russia how they didn't know about last week's chemical weapons attack in Syria.

McMaster: Ask Russia about chemical weapons

President Trump's National Security Adviser H.R. McMaster says the U.S. should ask Russia how they didn't know about last week's chemical weapons attack in Syria.