U.S. stocks opened lower on Monday, on track for a third day of declines, as investors await a decision from the Federal Reserve, which is expected to deliver another jumbo interest-rate hike on Wednesday. The S&P 500
SPX,
is down 31 points, or 0.8%, to 3,841. The Dow Jones Industrial Average
DJIA,
retreated 230 points, or 0.7%, to 30,605. The Nasdaq Composite
COMP,
declined 79 points, or 0.7%, to 11,373.