US stocks (^DJI, ^IXIC, ^GSPC) sink at Friday's market open after President Trump threatened 50% tariffs against the EU (European Union). The Morning Brief's Brad Smith monitors the morning market action and the moves across sectors,

In a separate social media post Friday, Trump called out Apple CEO Tim Cook and said the company’s iPhones would be subject to a tariff of at least 25 percent if they are sold in the U.S. but not man...