Home builders, car manufacturers and can makers are among those that will see higher prices for materials. Those companies could charge customers more.

Home builders, car manufacturers and can makers are among those that will see higher prices for materials. Those companies could charge customers more.

© Kevin Faingnaert for The New York Times

Despite an exemption from 50 percent tariffs, Britain still faces a 25 percent duty because its trade deal with the United States has yet to be put in place.

© Owen Richards for The New York Times

U.S. institutions are still largely functioning. But the deterioration of the country’s political culture is striking — and alarming.

President Trump hailed an agreement with Britain as a breakthrough — but far tougher negotiations, including with China, beckon.

The instructions from the office of Secretary General António Guterres were reviewed by The New York Times and came after President Trump ordered a review of U.S. funding to the agency.