Nvidia’s board of directors has opened an investigation into CEO Jensen Huang’s relationship with a person described as a Chinese spy, The New York Times reports. The probe follows Huang’s admission that he had an affair, according to Axios and Bloomberg. The board announced the inquiry in a statement published on Nvidia’s newsroom.

The case has also drawn attention from U.S. lawmakers. CNBC reports that Huang now faces scrutiny from members of both parties in Congress over the reported link to China.

Few further details have been made public. The available reporting does not specify the identity of the person involved, the timing of the relationship, or what the board’s review will cover. Nvidia’s own statement was issued as a board announcement, and the company has not disclosed additional information beyond what has been reported.

The disclosure places a national-security question at the center of one of the world’s most valuable chipmakers. Nvidia’s semiconductors are central to the artificial-intelligence boom and are subject to U.S. export controls involving China, which makes any reported foreign entanglement of its leadership politically sensitive. The board’s decision to investigate, alongside the congressional reaction, signals the matter is being treated as more than a personal controversy.

What to watch next: whether the board releases findings or a timeline for its review, and whether congressional committees announce hearings or requests for documents from Nvidia.