Robert Ford made the comments Tuesday at a House hearing, one day after President Bashar Assad accused U.S.-backed rebels of using such weapons in Aleppo province.
The Obama administration disputed that claim, and a U.S. official said there was no evidence that either Assad forces or the opposition had used chemical weapons in an attack in northern Syria.
Ford said that an increasingly besieged Assad regime might be tempted to use the weapons.
The chairman of the House Intelligence Committee said there was a “high probability” a chemical agent was deployed.











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