The fourth criminal case involving Donald J. Trump is likely to come to a head next week, with the district attorney in Atlanta expected to take the findings from her election interference investigation to a grand jury.
The Georgia investigation may be the most expansive legal challenge yet to the efforts that Mr. Trump and his advisers undertook to keep him in power after he lost the 2020 election. Nearly 20 people are known to have been told that they could face charges as a result of the investigation, which Fani T. Willis, the district attorney in Fulton County, Ga., has pursued for two and a half years.
Ms. Willis has signaled that she would seek indictments from a grand jury in the first half of August. In a letter to local officials in May, she laid out plans for most of her staff to work remotely during the first three weeks of August amid heightened security concerns. Security barriers were recently erected in front of the downtown Atlanta courthouse, and at lunchtime on Tuesday, 16 law enforcement vehicles were parked around the perimeter.
On Tuesday afternoon, two witnesses who received subpoenas to appear before the Fulton County grand jury said in interviews that they had not received notices instructing them to testify within the next 48 hours, a sign that the case will not get to the jury until next week.