"Economic nuclear winter" at risk without immediate tariff pause, Ackman says

The world faces an "economic nuclear winter" if President Trump doesn’t immediately pause his sweeping reciprocal tariffs, hedge fund manager Bill Ackman said Sunday night. Why it matters: The billionaire Ackman, a staunch Trump supporter, put the market’s fears about the fate of the global economy in the starkest terms possible. What they’re saying: "The President has an…