The government's investigation, which lasted nearly two years, was an early harbinger of the Obama administration's aggressive approach tracking down leakers.
An immigration judge approved Onyango's asylum request in 2010.
According to the investigative report, the employee denied discussing Onyango's immigration status until May 2010. He initially told investigators he spoke with an AP reporter only about getting together socially. After acknowledging that he was AP's source, the employee told investigators the decision was an "error in judgment." He said, "I had no political motivations," and told investigators that if he were trying to release information surreptitiously, he would have used a pay phone, not his office or cell phone. "I knew that would be a matter of record," he said.
The investigation concluded that the employee improperly revealed Onyango's immigration status, displayed a "lack of candor" with investigators, and misused government property by using an office telephone to disclose information to the AP.