US equity futures are pointing sharply lower to start the week, with Asian markets broadly higher and European equities trading a weaker open. Markets are reacting to Friday’s Supreme Court ruling striking down the IEEPA tariffs, followed immediately by President Trump announcing a new global tariff rate of 10%, later raised to 15% under a different authority. The move has injected fresh uncertainty into the trade landscape, with expectations that the administration will pursue additional trade investigations to restore its effective tariff rate. Questions also remain around potential tariff refunds after the court offered no clear guidance. The ruling and subsequent policy shift come against a backdrop of mixed macro data, including softer flash PMIs, hotter-than-expected core PCE, and below-consensus fourth-quarter GDP. Fed commentary leaned hawkish, with officials highlighting upside inflation risks and signaling that further tightening could return to the table if price pressures reaccelerate. Geopolitical tensions remain elevated amid discussions of a potential limited US strike on Iran, though risk assets had largely shrugged off the headlines late last week.

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