The judiciary committee in the House of Representatives issued subpoenas on Tuesday to the heads of Brown University and the University of Pennsylvania, demanding they surrender documents by July 22.
The committee opened a probe into collusion earlier this year and requested documents in April, but described the universities’ responses to be “inadequate”.
The lawmakers also issued a subpoena to Harvard last month and have sought information from Columbia, Dartmouth, Cornell, Princeton and Yale, all Ivy League institution