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.”

David Lebryk, a top Treasury Department nonpolitical career official, retired Friday after clashing with Elon Musk allies over government payment systems, a source familiar with the matter told The Hill on condition of anonymity.