Secretary of State Colin Powell says a divided U.N. will not keep the U.S. from using force, if necessary, to disarm Iraq. Experts debate whether Powell has convinced the international community to take action against Saddam Hussein.

While news organizations widely reported that the U.S. would seek a vote on a United Nations resolution authorizing war in Iraq next week, Russian officials said they might use their veto power to block such a measure. Gwen Ifill gets…