MADRID, Spain — The U.S. is not preparing for war against Iran and Vice President Dick Cheney supports that policy, Secretary of State Condoleezza Rice says, taking a swipe at a U.N. official who says he's worried about "crazies" who want to start bombing.

"The president of the United States has made very clear what our policy is. That policy is supported by all the members of his Cabinet and by the vice president of the United States," Rice said Friday.

"The president has made clear that we are on a diplomatic course," she said in regard to U.S. opposition to Iran's nuclear ambitions.

Rice, in Spain at the close of a European visit, was asked about the comments of the chief of the U.N. nuclear watchdog agency. Mohamed ElBaradei was quoted by the BBC as warning against the views of "new crazies who say 'let's go and bomb Iran."'

Cheney is frequently the administration's most hawkish voice on Iran, but Rice said she did not know to whom ElBaradei referred. The United States does not rule out military action but says there is no plan or intention to attack Tehran.

Cheney has not publicly advocated an assault on Iran, but he used the deck of an aircraft carrier in the Persian Gulf last month to warn Tehran that Washington would prevent the Islamic republic from dominating the Middle East.

Also stepping up pressure on Iran was President Bush, who demanded Friday that Iran "immediately and unconditionally" release four Iranian-Americans detained for alleged espionage and provide information about a former FBI agent missing in the country.