Five days before the war began in Iraq, as President Bush prepared to raise the terrorism threat level to orange, a top White House counterterrorism adviser unlocked the steel door to his office, an intelligence vault secured by an electronic keypad, a combination lock and an alarm. He sat down and turned to his inbox.

"Things were dicey," said Rand Beers, recalling the stack of classified reports about plots to shoot, bomb, burn and poison Americans. He stared at the color-coded threats for five minutes. Then he called his wife: I'm quitting.

Beers's resignation surprised Washington, but what he did next was even more astounding. Eight weeks after leaving the Bush White House, he volunteered as national security adviser for Sen. John F. Kerry (Mass.), a Democratic candidate for president, in a campaign to oust his former boss. All of which points to a question: What does this intelligence insider know?

"The administration wasn't matching its deeds to its words in the war on terrorism. They're making us less secure, not more secure," said Beers, who until now has remained largely silent about leaving his National Security Council job as special assistant to the president for combating terrorism. "As an insider, I saw the things that weren't being done. And the longer I sat and watched, the more concerned I became, until I got up and walked out."