Markets can handle bad news. What they struggle with is uncertainty. That’s why investors have spent much of 2026 reacting just as much to geopolitical headlines as to earnings reports — from Iran tensions to tariff threats to the growing militarization of trade routes. Now President Donald Trump has opened another front investors may need ... Trump Says U.S. Ground Forces Will Fight Mexico’s Drug Cartels: ‘If They’re Not Gonna Do the Job, We Will.’