U.S. Sens. Sherrod Brown (D-OH) and Chuck Grassley (R-IA) sent a letter today to U.S. Attorney General Eric Holder questioning whether the “too big to fail” status of certain Wall Street megabanks undermines the ability of the federal government to prosecute wrongdoing and impose appropriate penalties. They also requested that the Justice Department disclose the identities of parties with whom prosecutors consult about the appropriate level of penalties for financial institutions.