Global markets plunged Tuesday after President Trump reignited fears of a US trade war with the European Union, America’s largest trading partner. The president showed no signs of backing off his threat from Saturday to hit seven EU countries and the United Kingdom with new tariffs unless they supported his push for American control of Greenland. Asked if he would be willing to use force to seize the semi-autonomous Danish territory, Trump replied, “No comment,” on Monday. The S&P 500 sold off by around 1.3% in early trading, while the Nasdaq Composite plunged 1.7%. The Dow Jones Industrial Average dropped more than 600 points. The S&P 500 has erased its gains for the year so far. Investors also sold off U.S. government bonds, driving up interest rates. Rising returns on US treasuries usually translate into higher mortgage rates and interest on new personal loans.