Stocks tumbled on Friday after President Trump threatened to impose a fresh round of tariffs, this time aimed at Apple and the European Union.The S&P 500 fell 39 points, or 0.7%, to close at 5,803, while the Dow Jones Industrial Average shed 256 points,

President Donald Trump is threatening a 50% tax on all imports from the European Union as well as a 25% tariff on Apple products unless iPhones are made in America.

The twin threats, delivered via social media, roiled global markets after weeks of de-escalation had provided some reprieve.