“Our economy is fantastic; theirs is not so good,” he said.

Mr. Trump’s measures are putting the U.S., previously a steadfast advocate of global free trade, in an unfamiliar position: It now has the highest tariff rate among developed nations, outranking Canada, Germany, Russia and even China. The American economy is strong, but decreased trade could hurt even sectors that seem unrelated to importing and exporting goods, including research and development, retail, and marketing.

Another angle: Despite Beijing’s defiant tone on the trade war with the U.S., some in China argue that the countries benefit more from their economic relationship than either admits.

What’s next: Mr. Trump must decide by Friday whether to act on his threat to impose global auto tariffs. European officials would regard such measures as a breach of a tariff truce they worked out with the president last year.

“The Daily”: Today’s episode looks at what the U.S. and China have to lose from the trade war.

San Francisco bans facial recognition technology

With an 8-to-1 vote by the Board of Supervisors on Tuesday, the technology hub became the first major American city to block a tool that many police forces are turning to in the search for suspects .

“We have an outsize responsibility to regulate the excesses of technology precisely because they are headquartered here,” said Aaron Peskin, the city official who sponsored the bill.

Critics, including a local police officers’ association, say the ban would hinder investigations.

The details: The facial recognition fight in San Francisco is largely theoretical. The police department does not currently deploy such technology, and it is in use only at the international airport and at ports that are under federal jurisdiction and are not impacted by the legislation.