By the end of the trading day, the Dow Jones industrial average had fallen 600 points, or nearly 2.4 percent; the business community had ratcheted up criticisms of the president; and world leaders descending on the Group of Seven summit in France were confronted with the prospect of a global slowdown, triggered by a trade war with no end in sight.
The combination of events nearly eclipsed a Twitter tirade in which Trump questioned whether the Federal Reserve Chair Jerome H. Powell was an “enemy” of the U.S.