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The co-founder of Oracle and friend of President Trump, who was a flamboyant fixture in the 1990s, has returned to the spotlight through — of all things — TikTok.

Mr. Musk’s involvement in right-wing politics contributed to a 13% drop in deliveries in the first quarter, including steep declines in E.V.-friendly places like Norway.

They are expected to convene on Wednesday to discuss a potential sale of the app, which faces a Saturday deadline to change its ownership structure.

Sales of cars picked up recently partly as buyers rushed to lock in deals before President Trump’s 25 percent tariffs on cars and auto parts go into effect.

In Britain, amid growing evidence of harm to young people from extreme content online, a “Smartphone Free Childhood” campaign is going viral.

The start-up’s valuation, which has nearly doubled in six months, shows continued enthusiasm for A.I. among investors.

The company, which uses artificial intelligence to develop new treatments, now counts the venture capital firm Thrive Capital as a backer.

What did they think about the national security breach, in which Trump administration officials discussed attack plans in Yemen on a commercial messaging app?

The chairman, Brendan Carr, sent a letter to the company accusing it of violating equal employment opportunity regulations.

The deal combined two of Mr. Musk’s companies, which have been on different trajectories. The transaction valued xAI at $80 billion and X at $33 billion, the billionaire said.

The Swedish retailer H&M said it was exploring the use of artificial intelligence in producing “digital twins” of models.

The start-up, which provides the processing power to help develop A.I. systems, faces questions about its debt and the overall economy.

President Trump’s intervention came while Mr. Milton was appealing his conviction on securities and wire fraud charges.

“The group chats are popping off at the highest levels of government.”

Carmakers are likely to face higher costs regardless of how they respond to President Trump’s 25 percent tariffs on cars and auto parts.