India, April 8 -- Billionaire hedge fund manager Bill Ackman, a Donald Trump supporter and megadonor, issued an urgent plea to the former president Sunday night, cautioning that the United States is moving towards a "self-induced economic nuclear winter" if Trump's sweeping tariff strategy isn't paused and rethought. But he has a theory which may usher in the issue why so "unfair asymmetric tariff deals"?

Taking to X (formerly Twitter), Ackman called on Trump to declare a 90-day moratorium on his proposed 10% tariffs on all imports.

"The President has an opportunity on Monday to call a time out and have the time to execute on fixing an unfair tariff system," Ackman wrote. "Alternatively, we are heading for a self-induced, economic nucle...