A political action committee backed by billionaire Elon Musk is being investigated by the Michigan secretary of state’s office amid efforts to collect voter data.

Musk, the CEO of Tesla and SpaceX, has said he created and helped fund the America PAC, which is supporting former President Donald Trump. Musk has a net worth of over $225 billion, according to Forbes.

The committee has been acquiring detailed voter information from those living in Michigan and other battleground states after people submit their personal data through a section on the PAC’s website that says “register to vote.”