Jim Cramer, a prominent financial commentator, advised investors not to panic in response to a significant sell-off in U.S. stock futures on Sunday night. This statement was made in the context of an ongoing tariff-driven market downturn, as reported by CNBC. Cramer's message was aimed at members of his Investing Club, urging them to maintain a level head despite the market's anticipated ugly open on Monday. His comments come at a time when the market is experiencing volatility due to recent tariff announcements.