The Dow drops 300 points as Moody's downgrades U.S. debt and Trump attacks Walmart

U.S. stocks sank early Monday, with the S&P 500 dropping 1% at the open, the Nasdaq sliding 1.3%, and the Dow Jones Industrial Average down 297 points, or about 0.6%. The VIX spiked 13% and gold pushed higher, too. The declines followed fresh saber-rattling from the White House over Walmart’s (WMT) …