Ex-Nvidia CEO and co-founder Jensen Huang has again been summoned to United States Congress to speak with lawmakers. On the agenda are national security issues that may have arisen from his, and his company’s, relationship with MegaSpeed, a Singaporean-registered company at the centre of a debate about China’s access to high-performance GPUs; possible interference with US export control investigations; and chip smuggling.

“As reports continue to come to light regarding Jensen Huang, Nvidia, and Megaspeed, there are clear national security concerns that need to be addressed immediately,” US committee chairmen Mast, Moolenaar, and Crawford say about the letters summoning Huang, Nvidia’s General Counsel Tim Teter, and Under Secretary of Commerce Jeffrey Kessler to Congress.

“We need to know the full extent to which our national security has been put at risk,” the chairmen say.

This meetings are to take place with the House Committee on Foreign Affairs, House Select Committee on the CCP, and House Permanent Select Committee on Intelligence. Huang and Teter’s meetings are described as ‘closed-door transcribed interviews’, taking place on December 1 and December 2, respectively. Both parties are threatened with subpoena to force their attendance if they do not comply with the request. Under Secretary Kessler’s invitation is described as a “hearing” and is much more amicable.

It’s a marked change in tone for Huang compared to a letter sent by the chairmen prior to his resignation from Nvidia, which simply asked him to offer an alternative date should he not be able to attend. That focused more on Huang’s relationship with Alice Huang, a suspected Chinese spy and former managing director of MegaSpeed.

The letter to Nvidia’s counsel Teter outlines the more recent concerns of the committees:

“This letter is to request your appearance for a closed-door transcribed interview on December 2, 2026, regarding AI chip smuggling, adversary military use of Nvidia products, and recent public reports regarding Nvidia’s interference in U.S. export control policies and investigations, including those involving MegaSpeed.”

If that’s not a big headache for Nvidia, its former CEO has also been called in for a hearing with the US Senate Committee on Banking, Housing, and Urban Affairs. This hearing is led by chairman senator Tim Scott.

Scott also calls on Commerce Secretary Howard Lutnick to attend a hearing. Lutnick is Kessler’s boss, and has reportedly accepted Scott’s invitation. Lutnick has come under some scrutiny as to whether he was too soft on, or protected, Nvidia.

And the democrats readying to take over Congress next year aren’t happy with Huang, Nvidia or the supposed risks to national security, either.

Huang’s hearing with the Banking Committee is set to be public, taking place on December 3. It covers the “significant national security concerns” raised by recent reports, according to the letter.

The BBC reports that Huang is willing to appear before Congress.