chemical weapons chemical weapons

In this 1945 image, test subjects enter a gas chamber for a U.S. military experiment that will expose them to mustard gas. Courtesy of Edgewood Arsenal hide caption

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Courtesy of Edgewood Arsenal

Hassan Youssef, a 40-year-old victim of the April 4 chemical attack in Khan Shaykun, receives medical care in a hospital in the nearby Syrian city of Idlib in April. Omar Haj Kadour/AFP/Getty Images hide caption

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Omar Haj Kadour/AFP/Getty Images

A picture taken on April 4 shows destruction at a hospital room in Khan Sheikhun, a rebel-held town in the northwestern Syrian Idlib province, following a chemical weapons attack. Omar Haj Kadour/AFP/Getty Images hide caption

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Omar Haj Kadour/AFP/Getty Images

Treasury Secretary Steven Mnuchin talks to reporters during Monday's press briefing at the White House. Mnuchin announced sanctions against 271 employees of Syria's Scientific Studies and Research Center. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

President Trump, joined by Secretary of State Rex Tillerson (left), speaks during a bilateral meeting with the Chinese president in Palm Beach, Fla., on April 7. Alex Brandon/AP hide caption

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Alex Brandon/AP

A minivan drives past a portrait of Syrian President Bashar Assad in Damascus last week. U.S. forces fired a barrage of cruise missiles at a Syrian air base Thursday in response to what President Trump called a "barbaric" chemical attack he blamed on the Assad regime. Louai Beshara/AFP/Getty Images hide caption

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Louai Beshara/AFP/Getty Images

White House press secretary Sean Spicer answers reporters' questions during the daily news conference at the White House on Tuesday. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

White House Spokesman Stumbles Over Assad-Hitler Comparison

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A still from a video released by the U.S. Navy on Thursday evening shows the guided-missile destroyer USS Porter (DDG 78) as it conducts strike operations while in the Mediterranean Sea. U.S. Navy photo by Mass Communication Specialist 3rd Class Ford Williams hide caption

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U.S. Navy photo by Mass Communication Specialist 3rd Class Ford Williams

Syrian residents of Khan Shaykhun hold signs and pictures on Friday during a protest condemning a suspected chemical weapons attack on their town earlier this week. Omar Haj Kadour/AFP/Getty Images hide caption

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Omar Haj Kadour/AFP/Getty Images

In Syria, The News Of U.S. Missile Strike Is Greeted With Ambivalence

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A picture taken Friday shows the damaged Shayrat airfield at the Syrian military base targeted overnight by U.S. Tomahawk cruise missiles, southeast of the central Syrian city of Homs. AFP/Getty Images hide caption

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AFP/Getty Images

Experts in Turkey did autopsies on Wednesday on Syrians killed Tuesday in Idlib. Turkish Justice Minister Bekir Bozdag said results show they were subjected to chemical weapons in the attack by Syrian government forces. DHA-Depo Photos via AP hide caption

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DHA-Depo Photos via AP

A survivor of the suspected chemical attack receives treatment at a hospital in Khan Shaykhun on Wednesday. Cem Genco/Anadolu Agency/Getty Images hide caption

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Cem Genco/Anadolu Agency/Getty Images

A Syrian child is treated at a hospital in the town of Maaret al-Noman after a suspected chemical attack on April 4. Mohamed Al-Bakour /AFP/Getty Images hide caption

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Mohamed Al-Bakour /AFP/Getty Images