Many watchers expected the investigation to be drawing to a close this spring, when a flurry of reports claimed senior aides had begun sitting down for interviews with FBI agents and federal prosecutors. Government lawyers appeared to be circling around Clinton, with an eye on interviewing the candidate herself.

“I hope that this is close to being wrapped up,” Clinton said on CBS’s “Face the Nation” in May.

But nearly two months later, there have been no reports that an interview with the former top diplomat has taken place.

“I, like other people, am a bit surprised that it hasn’t come to a resolution yet,” said Douglas Cox, a professor at the City of New York School of Law.

He added that within Clinton’s campaign, “I would think internally that there would have to be a little bit of concern.”