Unpopular but unbowed, President George W. Bush defended his tumultuous two terms in a farewell address to the nation Thursday night, claiming a hard-won record of achievement. Reaching back to the Sept. 11, 2001, attacks, when the public rallied behind him, Bush declared the United States will "never tire, never falter and never fail." Leaving office with the highest disapproval rating since Richard Nixon, Bush said, "You may not agree with some of the tough decisions I have made, but I hope you can agree that I was willing to make the tough decisions." A bookend to eight years indelibly marked by terrorism, two wars and recessions, the 13-minute speech was Bush's last opportunity before he leaves office Tuesday to defend his presidency and craft a first draft of his legacy for historians. He spoke from the East Room of the White House with just 112 hours left in office.