Stock markets declined after the president’s early-morning threats of 25 percent import taxes on iPhones and 50 percent on goods from Europe.

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

President Donald Trump on Friday threatened a 50% tax on all imports from the European Union as well a 25% tariff on Apple products unless iPhones are made in America. The threats, delivered over social media,