In an interview with the London-based Financial Times, Zbigniew Brzezinski, who was national security adviser to former US president Jimmy Carter, said he feared a second Bush administration would not hesitate to use force against Iran in order to deal what it sees as a "nuclear threat". "Force will only unify the mullahs with the democratic opposition and derail political change in Iran," Brzezinski told the daily. "It may not stop Iran from buying nuclear weapons and will have adverse consequences in Iraq and Afghanistan."