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CNN obtained videos shown Thursday to members of the Senate Intelligence Committee that purportedly show the aftermath of a chemical attack in Syria.
President Obama is trying to make a case for military strikes against Syria and will address the nation from the White House at 9 p.m. ET Tuesday.
HLN's Natasha Curry talks with CNN Chief Medical Correspondent Dr. Sanjay Gupta about the effects of sarin gas.
READ MORE: Worth knowing: A starter's guide to Syria