Tech billionaire and Tesla founder Elon Musk walks through the Great Hall of the People with his son X Æ A-XII. Picture Alliance | Picture Alliance | Getty Images Elon Musk 's lead counsel, Steven Molo, apologized to the jury for his absence on Thursday, with the Tesla CEO accompanying President Donald Trump in China as closing arguments were made in the Musk-Altman trial. "This is something he is passionate about," Molo assured the jury about Musk's attention to the trial. The trial in federal court stems from a lawsuit Musk brought against his OpenAI co-founders, Sam Altman and Greg Brockman, alleging they had violated a promise to keep their company a nonprofit, and had unjustly enriched themselves by restructuring the business. Judge Yvonne Gonzalez Rogers had previously placed Musk on "recall status," meaning he was supposed to be available to return to the court, if needed, to testify on short notice, as NBC previously reported.…