US stocks retreated on Monday as investors grappled with the fallout from the Supreme Court's rebuff of President Trump's most sweeping tariffs, which has thrown major trade deals into doubt. The Dow Jones Industrial Average (^DJI) led the way down, losing roughly 1.3%, or over 600 points. Meanwhile, the S&P 500 (^GSPC) and the tech-heavy Nasdaq Composite (^IXIC) both fell roughly 0.6%, coming off a volatile but winning session on Friday. Growing uncertainty about the global trade landscape is unsettling markets amid debate about Trump's next moves and reaction from countries that have signed US trade pacts. The Supreme Court's...