Nvidia CEO Jensen Huang admitted to having an affair with a woman suspected by U.S. intelligence officials of being a Chinese spy, according to a draft email to employees obtained by Axios.

“I owe my family and all of you an apology,” Huang wrote, accepting responsibility for his actions.

Nvidia's board announced Sunday that an independent committee, assisted by outside legal counsel, would investigate reports that Huang was targeted by a foreign intelligence operation.

The board said it had “no reason to believe” national security or company secrets had been compromised. Huang has pledged to cooperate with the investigation.