A senior U.S. lawmaker says representatives of Elon Musk were granted “full access” to a U.S. Treasury payments system used to disperse trillions of dollars to Americans each year and warned that Musk’s access to the system poses a “national security risk.”

A Treasury Department official wrote a letter Tuesday to federal lawmakers saying that a tech executive working with Elon Musk's Department

Elon Musk's control of a federal payment system is raising concerns about funding for programs like Social Security and the safety of personal data.