Wall Street and Europe stocks slump after Trump's tariff threats on NATO members

The S&P 500 fell 1.2%, pulling back further from the record it set early last week. It was the first time U.S. markets could react to the escalation from Trump, as they were closed on Monday for Martin Luther King Jr. Day.The Dow Jones Industrial Average fell 536 points, or 1.1%, as of 10:56 a.m. Eastern. The Nasdaq composite slumped 1.5%.The losses were widespread and led by technology stocks, many of which already have more influence over the direction of the market because of outsized values. Retailers, ...