Elon Musk has poured cold water over a multi-billionaire dollar AI project announced by Donald Trump on Monday.

Elon Musk has cast doubt on Donald Trump’s $500 billion AI project by questioning whether it has enough financial backing. “They don’t actually have the money,” the MAGA billionaire wrote on X in a rare public dig at Trump just hours after the president made a big announcement about the privately funded initiative.

Altman and Musk were OpenAI’s founding co-chairs in 2015, but their relationship has devolved into name-calling and lawsuits.