Harvard received 54,008 undergraduate applications, about 5 percent fewer than last year, following the resignation of former president Claudine Gay amid plagiarism scandals.
Republican lawmaker Elise Stefanik, who is part of the committee leading the probe, has accused the 12-member board of attempted bullying and censorship of the press.
Representative Virginia Foxx, who is leading the investigation, sent a letter to Harvard Corporation leader Penny Pritzker and Interim President Alan Garber about the document deadline