Former U.S. president George W. Bush says he continues to have a "sickening feeling" about the failure to find weapons of mass destruction in Iraq, his main justification for approving the 2003 U.S.-led invasion that toppled dictator Saddam Hussein.
Mr. Bush discusses the Iraq war and other controversial moments of his presidency in his book Decision Points, released in bookstores across the U.S. Tuesday.
In an interview with NBC television to promote the book, the former president says the invasion was the right decision to make, and he feels no need to apologize. He contends that Iraqi citizens are better off without Saddam, whom Mr. Bush calls a "homicidal dictator."
The 64-year-old former president did acknowledge a number of mistakes during the government's botched response to Hurricane Katrina, which devastated New Orleans, Louisiana in 2005.
He says he failed to express his concerns for the victims of Katrina, many of whom were black, leading to accusations that he was racist. Mr. Bush calls the the experience the worst moment of his presidency.
He also writes of a rift with his vice president, Dick Cheney, after Mr. Bush refused to pardon Cheney's former aide, Lewis "Scooter" Libby. Libby was convicted of lying to federal agents investigating the public disclosure of a CIA operative, Valerie Plame. Mr. Bush says Cheney accused him of abandoning Libby, whom the vice president described as "a soldier on the battlefield."
Mr. Bush says he considered replacing Cheney after his first term in office to counter the belief that the vice president wielded enormous power in the White House.
Mr. Bush writes that replacing Cheney would - in his words - "demonstrate that I was in charge," but he decided to keep Cheney because the vice president helped the president "do the job."
The former president also writes that he personally approved the use of waterboarding, or simulated drowning, during the interrogation of alleged al-Qaida mastermind Khalid Sheikh Mohammed.