The former Massachusetts governor's comments came as thedesigned to isolate the government in Tehran. Romney applauded the move, while several Democratic presidential contenders spoke out against it - and used it as an opportunity to criticize front-runner .
Said former North Carolina Sen.: "I learned a clear lesson from the lead-up to the Iraq War in 2002: If you give this president an inch, he will take a mile and launch a war. Senator Clinton apparently learned a different lesson."
Clinton voted last month for legislation sponsored by Sens. Joe Lieberman and Jon Kyl designating Iran's Revolutionary Guard a terrorist organization, the only Democratic senator running for president who did so. Edwards and other critics say the measure could pave the way toward American military action there.
Democratic Sen.said he supports tough sanctions on the Revolutionary Guard, but he contended the measure Clinton supported "made the case for President Bush that we need to use our military presence in Iraq to counter Iran - a case that has nothing to do with sanctioning the Revolutionary Guard." Obama missed the Senate vote on the Revolutionary Guard, campaigning in New Hampshire.
In response, Clinton's campaign later issued a memo that quoted Obama arguing last year for keeping a reduced military force in Iraq as a counter to Iran. The memo accused him of engaging in "false attacks" against Clinton in an attempt to boost his campaign.
"Stagnant in the polls and struggling to revive his once-buoyant campaign, Senator Obama has abandoned the politics of hope and embarked on a journey in search of a campaign issue to use against Senator Clinton," the memo says.
"Nevermind that he made the very argument he is now criticizing back in November 2006. Nevermind that he co-sponsored a bill designating the Iranian Revolutionary Guard a global terrorist group back in April. Nevermind that his colleague from Illinois Dick Durbin voted the same way as Senator Clinton on (the Revolutionary Guard measure) and said 'If I thought there was any way it could be used as a pretense to launch an invasion of Iran I would have voted no,"' the memo continued.
It said that if Obama really thought the measure gave Bush authority for a war with Iran, he should have joined his colleagues in the Senate on the day of the vote.
"Instead, he did nothing, remained totally silent, skipped the vote and spoke out only after the vote to engage in false attacks against Senator Clinton," the memo said.
Sen., D-Conn., criticized the administration's announcement Thursday as well as Clinton's vote.
"The aggressive actions taken today by the administration absent any corresponding diplomatic action is exactly what we all should have known was coming when we considered our vote on the Kyl-Lieberman Amendment, and smacks, frankly, of a dangerous step toward armed confrontation with Iran," Dodd said.
Romney, who has been advocating a hard line against Iran throughout his presidential campaign, said military action would be necessary if severe economic and diplomatic sanctions don't convince Iranian leaders to abandon pursuit of a nuclear weapon.
The Iranian government contends its program is aimed toward providing nuclear power.
"If for some reasons they continue down their course of folly toward nuclear ambition, then I would take military action if that's available to us," Romney told a crowd of doctors and nurses during a question period that followed a health care speech.
He added: "That's an option that's on the table. And it's is not something which we'll spell out specifically. I really can't lay out exactly how that would be done, but we have a number of options from blockade to bombardment of some kind. And that's something we very much have to keep on the table, and we will ready ourselves to be able to take, because, frankly, I think it's unacceptable for Iran to have nuclear weapons."
Last year, while still governor, Romney refused to provide a security escort or any state services in support of former Iranian President Mohammad Khatami, who visited Massachusetts to speak at Harvard University.
In January, Romney traveled to a security conference in Israel, where he called for economic sanctions against Iran similar to those against South Africa during its apartheid period.
Subsequently, he has called for indicting Iranian President Mahmoud Ahmadinejad for saying "Israel's Zionist regime should be wiped off the map." Romney suggested using the U.N.'s Genocide Convention against the leader on charges of inciting genocide.
In September, he also chastised Columbia University for allowing Ahmadinejad to speak on its campus, and railed against the Iranian leader after he asked to visit ground zero.