236411 external_news 1378907711 1475893600 "The U.S. has a leadership position and has taken a leadership position in non-proliferation, in counter proflieration. So, those are really the driving pieces. It's stopping, or preventing, further proliferation of chemical agents, biological agents, and nuclear agents," said Margaret Kosal on HLN, "So, that's really the underlying facter that has propelled the U.S. historically and continues to propell the U.S. to this leadership role." Kosal is a professor in The Sam Nunn School of International Affairs.  Source:  HLN, August 31, 2013 

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