The government's case must be vigorously tested, even though much of the evidence involves nuclear secrets.

For years, little was done to stop the flow of nuclear secrets.

By then, analysts had concluded that the document indeed included American nuclear secrets, officials say.

"Over a twenty- year period, we allowed them to steal forty percent of our nuclear secrets!"

His lawyers threatened to force prosecutors to reveal nuclear secrets in court.

The candidates' media consultants treat their strategies like nuclear secrets.

"They guard their names like nuclear secrets, but I know of one and he should be enough for you."

The agency has 137 member states, and American officials believe some of them may be using the agency to hunt for nuclear secrets.

He ordered changes in the computer security procedures to make it more difficult to move nuclear secrets out of the classified networks.

Washington was awash in charges that China had stolen nuclear secrets.