May 28, CNN

WASHINGTON -- The spokesman who defended President Bush's policies through Hurricane Katrina and the early years of the Iraq war is now blasting his former employers, saying the Bush administration became mired in propaganda and political spin and at times played loose with the truth.

In excerpts from a 341-page book to be released Monday, Scott McClellan writes on Iraq that Bush "and his advisers confused the propaganda campaign with the high level of candor and honesty so fundamentally needed to build and then sustain public support during a time of war."

"[I]n this regard, he was terribly ill-served by his top advisers, especially those involved directly in national security," McClellan wrote.

McClellan also sharply criticizes the administration on its handling of Hurricane Katrina and its aftermath.

"One of the worst disasters in our nation's history became one of the biggest disasters in Bush's presidency," he wrote. "Katrina and the botched federal response to it would largely come to define Bush's second term."

Bush spokeswoman Dana Perino said the White House would not comment Tuesday because they haven't seen the book.

Frances Townsend, former Homeland Security adviser to Bush, said advisers to the president should speak up when they have policy concerns.

"Scott never did that on any of these issues as best I can remember or as best as I know from any of my White House colleagues," said Townsend, now a CNN contributor. "For him to do this now strikes me as self-serving, disingenuous and unprofessional."

Fox News contributor and former White House adviser Karl Rove said on that network Tuesday that the excerpts from the book he's read sound more like they were written by a "left-wing blogger" than his former colleague.

In a brief phone conversation with CNN Tuesday evening, McClellan made clear that he stands behind the accuracy of his book. McClellan said he cannot give on-the-record quotes yet because of an agreement with his publisher.

Read more this news quote

photo: Former White House spokesman Scott McClellan blasts President Bush and advisers in a new book. (Getty Images)