China has replaced North Korea as one of the top three US enemies, according to a poll of Americans. Iran topped the list, with 25 percent naming it when asked which country is the greatest US enemy, according to the Gallup Poll. Iraq was named by 22 percent and China 14 percent. North Korea was named by 9 percent - half the number who cited it a year earlier. Pyongyang agreed last year to disable its nuclear facilities in exchange for aid, though disputes have continued over implementing the deal. China, a growing economic rival of the US, was cited by 11 percent as the top enemy a year ago. Republicans are more than twice as likely as Democrats to name Iran as top US enemy, while Democrats are likelier to name Iraq. Older people and those who say they closely follow world news are less likely to name Iraq than the younger and less informed. No other country was named by more than 3 percent.