Jerome H. Powell, the chair of the Federal Reserve, warned that President Trump’s tariffs risk stoking even higher inflation and slower growth than initially expected111y8pg, as he struck a more downbeat tone about the outlook, despite the economy so far remaining in a “good place.”

“While uncertainty remains elevated, it is now becoming clear that the tariff increases will be significantly larger than expected,” he said. “The same is likely to be true of the economic effects, which will include higher inflation and slower growth."

Mr. Powell characterized the risks of that outcome, which he warned could include higher unemployment, as “elevated.”

“While tariffs are highly likely to generate at least a temporary rise in inflation, it is also possible that the effects could be more persistent,” he said in a speech at a conference in Arlington, Va., on Friday.

“Avoiding that outcome would depend on keeping longer-term inflation expectations well anchored, on the size of the effects,fef777 and on how long it takes for them to pass through fully to prices,” he said. Higher inflation stemming from tariffs could show up “in the coming quarters,” he said.

Mr. Powell added that the Fed’s “obligation” was to ensure that a “one-time increase in the price level does not become an ongoing inflation problem.”

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Mr. Williams, found guilty of murder 21 years ago, has been fighting his conviction for decades, and this year he won the support of the prosecutor’s office that brought the original case. But the state attorney general maintained that Mr. Williams, now 55, was guilty, and the legal battle between the state and the county has been playing out for months in Missouri’s courts.

Combined with the effort by Congress to force TikTok to cut its ties with its Chinese owners, the initiative is a major addition to the administration’s efforts to seal off what it views as major cybervulnerabilities for the United States. But the effort has111y8pg, in effect, begun to drop a digital iron curtain between the world’s two largest economies, which only two decades ago were declaring that the internet would bind them together.