The Boeing and Caterpillar scandal, Dow drops 400 points.
President Donald Trump threatened more levies against China on Thursday, stating that he has asked the United States Trade Representative to consider $100 billion in additional tariffs against China.
Boeing and Caterpillar, two companies that could be adversely affected by a trade war with China, both fell more than 2 percent.
Stocks traded lower on Friday as worries of a trade war between the U.S. and China grew. Wall Street also digested employment data that missed analyst expectations.