Trump was joined by Oracle founder Larry Ellison, OpenAI CEO Sam Altman, and SoftBank CEO Masayoshi Son, who said the investment would start with $100 billion, plus a goal of $500 billion over the course of four years.

At the core of this initiative is the formation of a new company, The Stargate Project, a joint venture between OpenAI, SoftBank, Oracle, and MGX. Over the next four years, this project will invest an astonishing $500 billion to develop cutting-edge AI infrastructure in the U.S., aiming to secure the country’s leadership in artificial intelligence.

Tesla Inc. CEO Elon Musk cast doubt Wednesday on the ambitious $500 billion Project Stargate, hours after its announcement, claiming lead investor SoftBank Group SFTBY -0.36% + Free Alerts SFTBF + Free Alerts has “well under $10B secured.”