Tech titan Elon Musk cast doubt Wednesday on a $500 billion AI project announced by US President Donald Trump, saying the ...

It's the latest in a feud between the two billionaires that started on OpenAI’s board and is now testing Musk’s influence with the new president.

Elon Musk stepped up a clash of billionaires after expressing skepticism about the finances of the backers of Stargate, an AI ...