Forty-six attorneys general have joined a New York-led antitrust investigation into Facebook

Forty-six attorneys general have joined a New York-led antitrust investigation of Facebook, officials announced Tuesday, raising the stakes in a sweeping bipartisan probe of the tech giant that could result in massive changes to its business practices.

The expanded roster of states and territories taking part in the investigation reflects lingering, broad concerns among the country’s competition watchdogs that “Facebook may have put consumer data at risk, reduced the quality of consumers’ choices, and increased the price of advertising,” Democratic New York Attorney General Letitia James said in a statement.

The Washington Post first reported on the states’ interest in joining the investigation. Will Castleberry, vice president for state and local policy at Facebook, said in a statement that the company would work “constructively with state attorneys general.”

The update on the state inquiry was announced the day before CEO Mark Zuckerberg was slated to testify on Capitol Hill about the company’s plans for the cryptocurrency Libra, which has triggered concerns from regulators over its potential impact on finances. Lawmakers are also expected to ask questions about the company’s struggles to protect users’ personal information, as well as about its revelation Monday that accounts originating in Russia sought to manipulate political conversations on its services ahead of the 2020 election.

Antitrust issues are also likely to arise, given the growing national unease with the size and power of Silicon Valley, along with growing fears that the country’s largest tech companies act in ways that unfairly harm rivals or result in higher prices or worse services for consumers.