A prominent hedge fund manager, Bill Ackman, warns that President Trump's newly announced tariffs might trigger what he describes as an 'economic nuclear winter.' The tariffs, which include a 10% baseline and up to 50% on certain nations, are intended to boost jobs but pose the risk of escalating trade wars and rising prices for Americans. While Trump defends the move, citing the benefits of increased investment and job creation, the response from international markets and economic analysts has been largely critical. Ackman's call for a 90-day negotiation window highlights the urgency and potential fallout from these sweeping economic changes.