A new poll finds Americans now think Iran is the biggest threat to the U.S.

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As recently as October, Iraq, China, and North Korea ranked as the most threatening.

The Pew Research Center for the People and the Press, which did the poll, says among people who've been following recent news about Iran, there's even greater concern.

President Bush has been warning about Tehran's nuclear program, which also worries many other countries.

The UN Security Council is taking it up, which prompted Tehran to order UN surveillance gear and seals be removed.

The poll found two-thirds or more of Americans think if Iran develops nuclear weapons, it's likely to attack Israel, Europe, or the U.S.

There's even greater concern Iran would pass nuclear weapons to terrorists.

“The public is clearer in its view of the potential threat posed by Iran than in what to do about it,” the Pew Center said.

“More Americans worry that we will wait too long than act too quickly in dealing with Iran's nuclear problem. However, far more Americans say the United Nations or the European Union rather than the U.S. should take the lead in dealing with the crisis.”