The president said he would not quickly reverse last week’s steep tariffs, which have sparked pushback and roiled markets.

© Haiyun Jiang for The New York Times

The loophole has allowed retailers to send goods from China directly to U.S. shoppers without paying tariffs. Closing it could raise consumer prices.

The additions included companies that are customers of Intel and Nvidia, and one firm that was the focus of a New York Times investigation last year.

Corporate chiefs see “chaos,” and investors see red as the effect of President Trump’s shifting trade policy begins to weigh on board rooms and trading rooms.

China’s top foreign affairs official, Wang Yi, cast his country as a force for peace and order even as Beijing provokes its neighbors and fuels trade tensions.

President Trump has offered a mix of reasons for upending global trade relations, baffling and angering America’s biggest trading partners.

Prime Minister Justin Trudeau of Canada warned that the Trump administration’s tariffs were leading to a trade war. Mexico’s leader vowed to impose countermeasures on Sunday.

China is still cautiously trying to figure out what Trump wants. The president has threatened big tariffs in response to the inaction.