Tesla stock was rising again Tuesday after thawing U.S.-Chinese trade relations gave the shares a big boost on Monday. Elon Musk, meanwhile, was one of many executives on hand for President Donald Trump’s visit to Saudi Arabia.

Tesla has increasingly shifted its focus toward robotics and autonomous technology in recent years. Musk said he recently demonstrated the company’s Optimus humanoid robots to both President Donald Trump and Saudi Crown Prince Mohammed bin Salman, and predicted the future deployment of “tens of billions” of such robots.