TSX futures fell sharply Monday as investors grappled with renewed uncertainty over U.S. trade policy. The decline followed the Supreme Court's ruling invalidating President Trump's use of emergency powers to impose tariffs, a decision that immediately triggered a 15% tariff hike on imports. The TSX 60 index futures contract dropped 2 points, or 0.1%, while the broader S&P/TSX composite index had risen 0.7% on Friday, surpassing a record high. The Supreme Court's decision fundamentally alters the legal framework for U.S. tariffs, potentially paving the way for a more predictable 15% global tariff structure. This ruling, however, introduces near-term volatility as markets digest the shift from emergency measures to a formal tariff regime. Nvidia's upcoming earnings on Wednesday are also under intense scrutiny, seen as a key indicator for the AI industry's health amid broader trade tensions.