After quizzing Uber on its data collection practices, U.S. Senator Al Franken now wants rival Lyft to explain its privacy policies.

The questions being raised about the handling of customer data by Uber and Lyft are the latest in a string of problems smartphone apps based ride-hailing companies face as their business model comes under criticism from traditional taxi companies and regulators.

The Minnesota Democrat, who is also chairman of the Senate Subcommittee on Privacy, Technology, and the Law, wrote in a letter Tuesday to Lyft CEO Logan Green that consumers should be able to decide whether and with whom they share their personal data, and must be assured that when data is shared it will be well protected.

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