The price of West Texas Intermediate crude oil contracts for December delivery settled down about 2% at $48.70 per barrel on Friday.
News of a new probe into Hillary Clinton's emails sparked volatility on Wall Street on Friday afternoon.
Donald Trump pounced on reports the FBI is digging more into Hillary Clinton's emails Friday. Stocks that stand to do well with him in the White House remained relatively flat.
Stock trading is choppy on Friday afternoon after federal investigators reopen a case into Democratic presidential candidate Hillary Clinton's email server.