Sen. Al Franken (D-Minn.), chairman of the subcommittee on Privacy, Technology, and the Law, issued a letter to Uber CEO Travis Kalanick on Tuesday calling for the company to provide better answers about Uber's customer privacy policies. This isn't the first time Franken has sent Uber such a letter. Franken first formally contacted Uber (as well as Lyft, in a separate letter) in November, asking a series of questions about how the car-hailing companies handle consumer privacy.