After scrapping the Biden administration’s executive order on artificial intelligence, President Donald Trump announced a half-a-trillion-dollar AI infrastructure plan alongside some of the technology’s top leaders.

OpenAI CEO Sam Altman called Stargate, “the most important project for this era” and promised that all of the new investment his company was making would help cure diseases. Altman was actually prompted by Trump to talk about the medical advances that AI would supposedly figure out.

Hours later, Elon Musk publicly questioned whether the joint venture would ever get off the ground.Musk wrote on X, his social-media platform, that two of the companies behind the project didn’t have enough capital to follow through on their pledges.