Rebounding tech stocks drove U.S. indexes higher Tuesday, a day after they tumbled on doubts about whether the artificial-intelligence frenzy really needs all the dollars being poured into it. The S&P 500 climbed 0.

Investors also assessed a return to a tougher tone on tariffs from President Donald Trump, ahead of the start of a Federal Reserve meeting

After plunging 17% on Monday, Nvidia looks set to recover on Tuesday, with its stock up 5% in premarket trade.