Chairmen of the House Select Committee on China and the Homeland Security Committee asked DoorDash CEO Tony Xu for documents on Chinese AI evaluation and deployment, CNBC reported. The letter cites co-founder posts describing Moonshot's Kimi K2.6 in lower-level code-review workloads, continuing a probe that already reached Cursor and Airbnb. DoorDash said it supports American AI leadership and will discuss safe use of frontier and open-weight models. Why it matters: Washington is treating PRC open-weight adoption as a security process issue. Caveat: a document request is scrutiny, not a ban or finding of misuse.