Governor Gavin Newsom has proposed a national tax on billionaires. This idea is part of his recent suggestions for the US government. Details on the proposal are limited, but it is known that Newsom is advocating for a national "billionaires' tax".

He also suggests that the US government should have a stake in companies that develop artificial intelligence. For more information on Newsom's proposal, readers can refer to the original report from ABC7 News. Further details on the suggested tax and the potential role of the US government in AI companies can be found there.