The issue focused on the article in his book, "An American Tragedy: And How to Make It Right."

A statement from Mr. Obama's campaign said that he has been working with leaders of both parties to come up with a plan to protect against terrorism.

"This is not an easy job," said Mr. Obama, who also plans to meet Friday with President Bush. "We have to go after people who are trying to kill us and make sure we're doing everything possible to