The Dow sank 1%, or nearly 500 points, retreating from morning gains. The S&P 500 suffered a 1.4% loss. The Nasdaq composite was the hardest hit of the major indexes with a 1.9% drop. Small-cap stocks weren't spared the sell-off, with the Russell 2000 index diving 1.6%.

President Trump on Friday threatened to impose more tariffs on imports from China and cancel an upcoming meeting with the Chinese leader Xi Jinping, saying that curbs that China put out this week on i...

Not only would the global trade war instigated by Trump be rekindled at dangerous levels, but import taxes being heaped on top of the 30% already being levied on Chinese goods could, by the administra...