london outgo cia director john brennan say would height folly u.s. president-elect donald trump tear washington deal tehran would make likely iran others would acquire nuclear weapons could lead weapons program inside iran could lead state region embark program brennan say interview bbc air wednesday think would height folly next administration tear agreement brennan also say deal syrian crisis trump cautious try work russia hope go improvement relations washington moscow say president-elect trump new administration need wary russian promise russian promise mind give us pledge cia 's brennan say tear iran deal would 'folly