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Dave Grohl also paid tribute to his late mother during Foo Fighters' set.

During his electrifying performance at the Power to the People Festival in Maryland on Saturday night, rock icon Dave Grohl had a pointed message for U.S. Senator Eric Schmitt (R-Mo.)—and it came in the form of his T-shirt. As Grohl took to the stage, he donned an Iowa Hawkeyes shirt, humorously referencing Schmitt's recent public embarrassment. The Senator had made headlines for accusing special counsel Jack Smith of perjury during a Senate Judiciary Committee hearing earlier in the week.

Dave Grohl had a message for Sen. Eric Schmitt (R-Mo.) on Saturday night, and he delivered it with his shirt.The Foo Fighters frontman took the stage at the Power to the People Festival in Maryland we...