The billionaire is almost entirely bankrolling the PAC himself—and his $1 million offers to voters are drawing legal scrutiny.

Elon Musk’s super PAC didn’t announce a winner for its “daily” $1 million giveaway to registered swing state voters on Wednesday, the same day news broke that the Justice Department warned Musk’s group that its sweepstakes might be illegal.

The Justice Department has sent a letter to tech billionaire Elon Musk’s super PAC, America PAC, warning that its $1 million daily giveaway in battleground states may run afoul of federal law, a source familiar with the matter said.