The Dow Jones Industrial Average dropped more than 500 points on Thursday, continuing a two-day slump.
The day before, the Dow fell more than 800 points on the back of big tech stocks like Amazon, Apple and Netflix, all of which dropped in value.
"I think the Fed is out of control, I think what they're doing is wrong," President Trump said Thursday.
President Donald Trump put the blame on the Federal Reserve, which raised interest rates last month in light of continued economic growth.
But analysts say there are other reasons for the volatility, including economic tensions with China, which the president has escalated.
Additional reporting by Newsy affiliate CNN.