Ken Griffin, the CEO of Citadel, delivered a pointed critique of President Donald Trump’s confrontational approach to U.S. trade relations, expressing worry about its repercussions.

“From my perspective, the divisive language has already resulted in significant damage,” Griffin stated on Tuesday at the UBS Financial Services Conference in Key Biscayne, Florida. “Resorting to such rhetoric is a serious error, especially when attempting to negotiate, as it undermines the confidence of CEOs and policymakers in America’s reliability as a trading partner.”

His remarks followed President Trump’s latest decision on Monday to impose a 25% tariff on steel and aluminum imports. The administration has already implemented a 10% tariff on all goods from China and has temporarily suspended a 25% tariff on products from Mexico and Canada.

Griffin, who supported Trump and significantly contributed to Republican campaigns, warned that aggressive tariff strategies could complicate long-term investment strategies for global corporations and investors. “This creates difficulties for multinationals when contemplating plans for the next five, ten, fifteen, or even twenty years, especially concerning substantial capital investments that might be negatively influenced by the erosion of current trade terms among leading Western nations,” he noted.

Previously, Griffin had expressed concerns that tariffs could pave the way for crony capitalism, a system where business leaders and government officials establish close, mutually beneficial relationships.

The White House has yet to respond to inquiries regarding this matter.