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Mr. Fly served as a director for counterproliferation policy at the National Security Council during the Bush administration.

Ms. DeSutter said she recommended during the Bush administration using Libya’s mustard gas as part of a counterterrorism sting operation to entice terrorists to come to Libya.

“I suggested at the time that we go on jihadi network websites and announce, not as the U.S. government, but surreptitiously as a phony jihadist, that Libya had all of this mustard gas, then give the location,” she said.

“The hope was the terrorists would try to infiltrate the facility and thereby eliminate a number of terrorists. But nobody picked it up and ran with it. The point is we did not view this as a proliferation risk as much as a health and safety risk.”