U.S. government officials called it "the invisible second-government of the nation."

The institute has also served U.S. government officials and policymakers.

U.S. government officials may not act as agents, attorneys, or in a fiduciary capacity.

In the information age, what senior U.S. government officials say to an American audience is very likely to be heard or read around the world.

The senior U.S. government official here, she learned, was called the planetary protection officer.

U.S. government officials later denied any role in planning, advising or paying for the trip.

He had replaced a man who'd been too timid to make the necessary approaches to U.S. government officials.

His work was important reading for U.S. government officials and others concerned with making policy towards Japan.

This information was provided to senior U.S. government officials in July 1998.

He became only the third U.S. government official to be removed by the impeachment process.