Candidates see Iran nuclear threat

By Carol Giacomo, Diplomatic Correspondent

WASHINGTON (Reuters) - U.S. presidential candidates agree Iran should not be allowed to acquire nuclear weapons but at this point in the 2008 campaign, their prescriptions for preventing such an outcome are vague.

Dealing with Iran -- its nuclear ambitions, its involvement in Iraq and its opposition to Israeli-Palestinian peace efforts -- commands a lot of President George W. Bush's attention.

But he is not likely to resolve the conflicts before leaving office in January 2009, so Iran is expected to be among the more difficult foreign policy challenges inherited by his successor, U.S. officials and experts say.

"Allowing Iran, a radical theocracy that supports terrorism and openly threatens its neighbors, to acquire nuclear weapons is a risk we cannot take," Democratic Sen. Barack Obama of Illinois said in a letter to the Israel Project, a pro-Israel group that educates the public about Israel and advocates an end to investment in Iran.

Obama's tough line on Iran was largely echoed in other letters from seven other candidates, including Sen. Hillary Clinton of New York and former Sen. John Edwards of North Carolina, both Democrats.

Two Republican candidates -- former Massachusetts Gov. Mitt Romney and Sen. Sam Brownback of Kansas -- stressed, as Bush has done, that the military option must remain on the table.

All were asked by the Israel Project to discuss their views and endorse a petition signed on-line by more than 75,000 people telling the United Nations Security Council "Iran must be stopped now -- before it develops a nuclear bomb."

Tehran, which insists its nuclear program is entirely peaceful, has defied a Security Council demand to halt its uranium enrichment program, resulting in two sets of sanctions. A third sanctions resolution is under consideration.