Calling the European Union "very difficult to deal with," President Donald Trump said Friday the United States would move to enact a 50% tariff on the EU.

The president threatened both Apple and the European Union with higher tariffs on Friday, saying trade talks with the Europeans had stalled.

WASHINGTON—President Trump fired new salvos in the global trade war on Friday, threatening a 50% tariff on imported goods from the European Union and new duties on iPhones and other smartphones made overseas.