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But this is a difficult process, a lot of moving parts. >> meanwhile, isis is moving towards the capital, baghdad. the u.s. military says there are now 750 u.s. troops on the ground in iraq. >> jennifer griffin at the pentagon, thank you. joining us now, stewart holliday, the former u.s. a ambassador for special political affairs at the u.n. ambassador holliday, what are the choices that the u.s. has now? what are the options? what can we do? >> well, in the longer term, there are three candid...