President George W. Bush said on Saturday U.S. troops in Iraq were fighting to protect Americans at home from more attacks like those of Sept. 11, 2001, starting a five-day focus on his case for the war amid growing public discontent. "Our troops know that they're fighting in Iraq, Afghanistan, and elsewhere to protect their fellow Americans from a savage enemy," Bush said in his weekly radio address carried by Reuters. "They know that if we do not confront these evil men abroad, we will have to face them one day in our own cities and streets, and they know that the safety and security of every American is at stake in this war, and they know we will prevail," he said. His comments came as the public shows more discontent with his handling of Iraq, with high-profile protests during Bush's ranch vacation and new poll results showing nearly six in 10 Americans are worrying about the outcome of the war. Asked whether the United States was meeting its objectives in Iraq, 56 percent of those polled said it was not and 39 percent said it was. The poll is to be published in next month's issue of Foreign Affairs, the journal of the Council on Foreign relations. --More 2059 Local Time 1759 GMT