Though maybe some of the other things Musk was doing were of murky legality, this one is clearly illegal,” wrote Richard L. Hasen, a law professor at the University of California, Los Angeles.

The giveaway is raising questions and alarms among some election experts who say it is a violation of the law to link a cash handout to signing a petition that also requires a person to be registered to vote.

Elon Musk is pledging to give away $1 million to voters for signing his political action committee’s petition backing the Constitution