Robert Ford, former U.S. ambassador to Syria, said he resigned his post because of the Obama administration's failed Syria policy and he predicted that another 300,000 to 400,000 Syrians will die if nothing is done to stop the bloodshed.

Asked by Sharyl Attkisson on "Full Measure" Sunday why he had resigned, Ford said: "The reason is, I could no longer defend the administration's policy on Syria."

He then repeated three times that he knew the policy "wasn't working."

He resigned just after administration officials announced that Obama had approved a plan to provide training and equipment to moderate Syrian rebels. The $500 million program was ended this week after it came under fire for training only a handful of rebels in the fight against the Islamic State. Many of the weapons the U.S. sent to the moderates quickly passed to al Qaeda in Syria and other jihadist groups.

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