Microsoft CEO Satya Nadella had the quote of the week in response to a question from CNBC’s Andrew Ross Sorkin about Elon Musk questioning the ability of the new Stargate Project‘s financial backers to invest up to $500 billion in AI infrastructure.

Two of the most powerful tech leaders in the world, Microsoft CEO Satya Nadella and Tesla CEO Elon Musk, are not exactly fans of the $500 billion Stargate AI initiative announced by Trump this week.

The rivalry between Musk and OpenAI CEO Sam Altman has only added to the controversy surrounding Stargate. Musk, who cofounded OpenAI in 2015 before splitting from the organization, has openly clashed with Altman on social media, calling him a “swindler” and resurfacing Altman’s past criticism of Trump.