Bill Ackman, once a Trump supporter, now expresses concern over the president's tariff policies, warning of potential economic devastation. He believes Trump's approach is eroding global confidence in the U.

The Wall Street mogul warned of “economic nuclear winter” as the threat of an all-out trade war triggers a global market meltdown.

A billionaire hedge fund boss who backed Donald Trump has turned on the president warning his tariffs risk an “economic nuclear winter”.