The U.S. Congress is investigating Nvidia and former CEO Jensen Huang over national-security concerns, semiconductor export controls and the company’s ties to Singapore technology firm Megaspeed. Huang resigned on Nov. 13 after his relationship with Alice Huang, a Megaspeed executive suspected of being a Chinese spy, became known. Lawmakers are examining whether that relationship affected U.S. artificial-intelligence leadership and national security, as well as allegations that Megaspeed helped smuggle restricted Nvidia chips into China. They are also scrutinizing the Commerce Department’s Bureau of Industry and Security and Secretary Howard Lutnick over enforcement of controls on indirect shipments. Senate Banking Committee Chairman Tim Scott has demanded testimony from Huang and Lutnick in December, while House Foreign Affairs Committee Chairman Brian Mast said Huang agreed to appear before a House committee and could face a subpoena. Democrats, who are set to become the majority party in both chambers in January, have also called for answers from Huang, Nvidia’s management and board. The investigation expanded after Nvidia General Counsel Tim Teter disclosed contacting BIS chief Jeffrey Kessler about the Megaspeed inquiry, which was later transferred to the Justice Department. Earlier scrutiny focused on Kessler’s handling of Nvidia-related export policy, including the decision not to add Megaspeed to the U.S. trade entity list and the agency’s consideration of inviting Huang to a Jan. 10 conference. The controversy has also surrounded the Trump administration’s policy allowing licensed Nvidia H200 shipments to China, under which the government would receive 25% of purchase revenue, and BIS’s failure to replace a Biden-era rule restricting access to cutting-edge semiconductors. The episode has put the intersection of AI-chip controls, national security and government oversight at the center of Washington’s scrutiny of Nvidia.