Musk could not tolerate seeing such success for an enterprise he had abandoned and declared doomed,” read a suit by OpenAI co-founder Sam Altman.

U.S. Commerce Secretary Howard Lutnick said on Sunday in an interview with ABC's "This Week" that smartphones, computers and some other electronics will come under separate tariffs, along with semiconductors that may be imposed in a month or so.

In a legal filing, OpenAI asked a federal court to hold Mr. Musk responsible for any damage he has caused the firm, in the latest sign of their bitter feud.