WASHINGTON (Reuters) - Democratic presidential candidate Hillary Clinton warned Tehran on Tuesday that if she were president, the United States could "totally obliterate" Iran in retaliation for a nuclear strike against Israel.

On the day of a crucial vote in her nomination battle against fellow Democrat Barack Obama, the New York senator said she wanted to make clear to Tehran what she was prepared to do as president in hopes that this warning would deter any Iranian nuclear attack against the Jewish state.

"I want the Iranians to know that if I'm the president, we will attack Iran (if it attacks Israel)," Clinton said in an interview on ABC's "Good Morning America."

"In the next 10 years, during which they might foolishly consider launching an attack on Israel, we would be able to totally obliterate them," she said.

"That's a terrible thing to say but those people who run Iran need to understand that because that perhaps will deter them from doing something that would be reckless, foolish and tragic," Clinton said.

Her comments appeared harder than a week ago, when during a presidential debate she promised "massive retaliation" against any Iranian attack on Israel.

Obama rejected Clinton's rhetoric as saber rattling on a day when Pennsylvania Democrats voted in a party primary contest that could help decide which Democrat will face Republican John McCain fo... >>>