From Politico:

“I think most of [the probes] could be closed but the attorney general won’t let them be closed. That’s an acknowledgment that there’s no there there,” said Paul Rosenzweig, a senior fellow at the nonpartisan R Street Institute and a former senior counsel to Clinton-era independent counsel Kenneth Starr.

“The value in them,” he added, “is their existence and the president and Sean Hannity gets to tout them as evidence that where there’s smoke there must be fire.”