Senator Elizabeth Warren (D-MA) takes part in an International Brotherhood of Electrical Workers (IBEW) phone bank in Boston, Massachusetts, U.S. December 2, 2022.
Warren said Musk had not explained how he will manage conflicts between his role as Twitter CEO and his position at Tesla.
"Twitter relies on advertising revenue from automobile companies that are in direct competition with Tesla, including Audi, Chevrolet, Ford, GM, Jeep, and Volkswagen,” wrote Warren.
“As the owner of Twitter, Mr. Musk may decide to run the company to maximize badly-needed revenue, even if that includes great deals for Tesla’s competitors and potential injury to Tesla."
Separately, Twitter users voted in a poll for Elon Musk to step down as CEO.