India, April 7 -- Hedge fund manager Bill Ackman has called President Donald Trump's decision to impose reciprocal tariffs a "mistake" and warned of a looming "economic nuclear winter" if the tariffs are not immediately paused.

In a post on X this Sunday, Ackman said, "By placing massive and disproportionate tariffs on our friends and our enemies alike and thereby launching a global economic war against the whole world at once, we are in the process of destroying confidence in our country as a trading partner, as a place to do business, and as a market to invest capital."

Ackman emphasized the need for a 90-day pause to allow Trump time to "negotiate and resolve unfair, asymmetric tariff deals," which could attract "trillions in new inv...