US President Donald Trump said he didn’t discuss approving sales of Nvidia Corp.’s Blackwell chips to China with his counterpart Xi Jinping, dampening speculation that Washington will allow exports of the powerful AI accelerators to the world’s largest semiconductor market.Trump said he and Xi talked about Nvidia’s access to China in general and that the chipmaker would continue conversations with Beijing, which has discouraged domestic firms from using less-advanced Nvidia processors that Washi...