Microsoft CEO Satya Nadella took the witness stand Monday in a trial about control of the artificial intelligence startup OpenAI.

Microsoft CEO Satya Nadella testified in federal court on Monday that Elon Musk never contacted him with concerns that Microsoft's investments in OpenAI violated any special terms or commitments. Musk testified that Microsoft's increasingly lucrative arrangement with OpenAI is what convinced him that Sam Altman was atteping to "steal the charity."