PHILADELPHIA —  Democratic presidential candidate Dennis Kucinich questioned President Bush's mental health in light of comments he made about a nuclear Iran precipitating World War III.

"I seriously believe we have to start asking questions about his mental health," Kucinich, an Ohio congressman, said in an interview with The Philadelphia Inquirer's editorial board on Tuesday. "There's something wrong. He does not seem to understand his words have real impact."

Kucinich, known for his liberal views, trails far behind the leading candidates in most Democratic polls. He was in Philadelphia for a debate at Drexel University.

Bush made the remarks at a news conference earlier this month.

He said: "I've told people that if you're interested in avoiding World War III, it seems like you ought to be interested in preventing them (Iran) from having the knowledge necessary to make a nuclear weapon."

Kucinich said he doesn't believe his comments about the president's mental health are irresponsible, according to a story posted on the newspaper's Web site.

"You cannot be a president of the United States who's wanton in his expression of violence," Kucinich said. "There's a lot of people who need care. He might be one of them. If there isn't something wrong with him, then there's something wrong with us. This, to me, is a very serious question."