Pressure is mounting on state and federal prosecutors to investigate tech billionaire Elon Musk’s $1 million lottery-style giveaway to registered voters in seven battleground states.

At least one election law expert is already questioning the legality of Musk’s million-dollar giveaway for supporters of his PAC’s petition.

Elon Musk’s latest effort to get swing state voters to the polls is raising legal questions after he announced this weekend that he plans to give $1 million once a day to a random registered Pennsylvania voter who signs the petition for his political action committee (PAC).