“That banner was not supposed to say ‘Mission Accomplished’,” Bush said. “It was supposed to say ‘Still Difficult Work Ahead’.”

Bush said that he did not notice the typo at the time, and only caught it one year later while watching a news report marking the anniversary.

But the president surprised many observers by refusing to apologize for the typo, instead calling it the work of “evildoers.”

Adopting a stern and resolute tone, President Bush warned, “The person or persons responsible for this and other typos will be brought to justice.”

Privately, Bush’s aides hoped that his explanation of the erroneous banner would blunt growing criticism that the White House had failed to catch crucial typos planted by terrorists despite persistent warnings that such typos were in the works.

In particular, during the 9/11 commission’s interrogation of Condoleezza Rice, the national security adviser admitted that the president had received a President’s Daily Brief or PDB dated September 4, 2001 entitled, “Bin Laden Determined to Sneak Typos into Banners Onboard Aircraft Carriers.”

At the conclusion of his radio address, the president also tried to put to rest the lingering controversy about his military status during the Vietnam War, telling his radio audience, “Go ahead and look at my Vietnam war record–you won’t find anything.”