A New York City Council hearing on artificial intelligence yielded few answers or assurances about how the industry would provide safeguards against catastrophic scenarios.

In Nebraska, President Trump announced an executive order to waive an off-road requirement for the fuel, which is exempt from the federal highway tax.

Rising borrowing costs are taking a toll on households and businesses. But they are doing little to dampen enthusiasm for investments in A.I. infrastructure, which are contributing to inflation.

Strikes on tankers in the Strait of Hormuz and oil infrastructure in Saudi Arabia came as the region’s exporters were getting more oil to the world market.

Trade blockages in the Persian Gulf have reminded the world that there are forces as great as or greater than technology and globalization.

Ken Paxton, the Texas attorney general and Republican Senate candidate, has alleged a sprawling profit-driven conspiracy. Pediatricians say the accusations are an attempt at intimidation.

Another executive departed OpenAI, raising questions about the company’s commitment to safety.

Mark Thompson told the network’s employees that he had faith that David Ellison, the chief executive of Skydance, would support “independent news that CNN has always stood for.”

A fierce and nimble speaker, Ms. Leavitt is the second of Mr. Trump’s former press secretaries to join the cable news network.