A bipartisan group of lawmakers is pressing more than 20 data broker companies, including Equifax , Oracle and Whitepages, to reveal the types of information they collect on U.S. consumers and how they distribute it, according to letters shared exclusively with CNBC. The letters ask whether the brokers consider any type of data to be off limits for them to buy or sell, what restrictions they put on data they share with third parties and how they verify the accuracy of the data they collect and distribute. In that report, the regulator recommended that Congress force brokers to give consumers greater control over their data, but the "data brokers can easily circumvent existing rules and laws," the letter said.