The billionaire hedge fund founder's comments came after Trump on Monday evening signed an order that would impose 25% tariffs on steel and aluminum imports.
In a memo to OpenAI employees on Tuesday, CEO Sam Altman said the board hasn't received an official offer from Elon Musk regarding a potential purchase.
A communique entitled "Statement on Inclusive and Sustainable Artificial Intelligence" showed both the U.S. and U.K. were absent from a list of signatories.