US stocks erased the prior session's gains and closed lower on Wednesday.
The Dow closed below 20,000 total points for the first time since 2017. It was down 6.3%, or 1,338 points, on the day.
During the afternoon, the index fell so much that it erased all of the gains accumulated under the Trump administration — though it closed slightly above that key level.
The S&P 500 is also edging closer to falling below its January 2017 level. The index finished down 5.2%.
The Nasdaq Composite closed down 4.7%.
Trading was briefly halted in the early afternoon after the S&P fell 7%, triggering the New York Stock Exchange's circuit breaker.
As stocks settle after the trading day, levels might still change slightly.