Trump has denied the affair happened and called the investigation by Bragg, a Democrat, a witch hunt. An additional witness is expected to appear before the grand jury on Monday, at the request of Trump's lawyers, a person familiar with the matter said on Saturday. Advertisement · Scroll to continue Trump's statement that he expected to be arrested on Tuesday is based on news reports that Bragg's office is going to be meeting with law enforcement to prepare for a possible indictment, said the person, who spoke on the condition of anonymity.