Tariff 'Weaponry' Keeps Investors Alert as Trump Puts Euro in Twitter Spotlight

President Donald Trump reminded investors Tuesday that Europe, and its $1.2 trillion auto sector, might be next on his tariff hit-list.

Trump tweeted that the euro, as well as other global currencies, are "devalued" against the dollar, which itself is trading a two-and-a-half month low on foreign exchange markets, and that this put the U.S. at a disadvantage in world trade. TheStreet's founder, Jim Cramer, thinks Trump's use of tariffs to extract...