Investor Steve Eisman, best known for betting against the housing market in the lead-up to the 2008 financial crisis, issued a sharp warning on what he sees as the single-biggest threat to the U.S. economy.

What Happened: On The Real Eisman Playbook podcast on Friday, Eisman said, “The underlying fundamentals of the United States economy are quite strong,” referring to the 3% growth in GDP during the second quarter, which marks a rebound from the prior quarter.

According to Eisman, the only thing that can “derail” this momentum, is “a trade war,” referring to a slew of new tariffs that were announced by President Donald Trump over the past week.

See Also: ‘The Trade War Has Lost All Credibility:’ Markets Shrug Off Trump’s Tariff Blitz On Multiple Countries

“Now, the deadline …

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