Bob Woodward's secret source, W. Mark Felt, who was worried that President Nixon wanted to rein in the FBI, helped destroy him by illegally leaking government secrets. As a naval officer, Woodward met Felt in the office of Admiral Thomas Moorer. Moorer and other Pentagon hawks illegally spied on the same President and his aides as they tried to end the Vietnam war and improve relations with the Soviet Union and China.
You can easily write all that and never even use the word "Watergate." Go figure.