Republican presidential hopeful and current Senator John McCain (R-AZ) speaks to supporters at the annual Republican Party of Iowa's Abraham Lincoln Unity Dinner in Des Moines, Iowa April 14, 2007. McCain crooned the words "Bomb Iran" to a Beach Boys' tune in joking response to a question about any possible U.S. attack over Tehran's suspected nuclear weapons program. REUTERS/Frank Polich

WASHINGTON (Reuters) - Republican 2008 presidential hopeful John McCain crooned the words “Bomb Iran” to a Beach Boys’ tune in joking response to a question about any possible U.S. attack over Tehran’s suspected nuclear weapons program.

“That old Beach Boys song, Bomb Iran ... bomb, bomb, bomb, bomb,” the Vietnam War veteran warbled softly to the band’s “Barbara Ann” when he was asked when the United States would send an “airmail message” to Iran.

The singing performance during a campaign stop on Wednesday in South Carolina drew chuckles from the audience and has already been viewed almost 11,000 times on the Internet video sharing site YouTube after being posted on Thursday.

Campaign spokesman Matt David said the question was asked somewhat in jest and that the Arizona senator was adding some levity to the discussion.

The United States and others have accused Tehran of seeking nuclear weapons, a charge Tehran denies. While U.S. officials have refused to take the military option off the table, they have said there were no plans to attack Iran and they would pursue a diplomatic solution.

McCain also gave a serious answer focusing on Iran’s nuclear ambitions and desire to destroy Israel.

“It bothers me a great deal that they (Iran) might have a nuclear weapon or a missile, but it bothers me also to have a nuclear weapon knowing their relationship with various terrorist organizations, that they would give it to a terrorist organization,” McCain said.

McCain’s run for the White House, his second, has experienced some difficulties. He was third among Republicans in raising money during the first quarter, $12.5 million, and has been spending it as a faster clip than many candidates.