Atkins was arrested after a traffic stop and was found in possession of cocaine, leading to a drug charge as well. He was being held without bond Saturday. The public defender's office that is representing him was closed Saturday and not available for comment.
The nature of the alleged online threats was not immediately released. Atkins lives a few miles from Trump's Mar-a-Lago resort in Palm Beach, but there was no indication he took any steps toward going there.
West Palm Beach police said the Secret Service will determine whether any federal charges will be filed.