DETROIT — Elon Musk is threatening to walk away from his $44 billion bid to buy Twitter, accusing the company of refusing to give him information about its spam bot accounts.

Elon Musk reached an agreement to buy Twitter for about $44 billion on April 25, promising a more lenient touch to policing content on the platform where he promotes his interests, attacks critics and opines on social and economic issues to more than 83 million followers.