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

"Thank you on behalf of all Americans," Ackman wrote in a post on social media platform X. Shortly after, he added, "[Treasury Secretary Scott Bessent] rocks!"

Billionaire hedge fund manager Bill Ackman had been outspoken for days, urging Trump to reconsider his tariff strategy.