Deputy U.S. Attorney General Rod Rosenstein replied in the affirmative when asked if he is satisfied with Robert Mueller’s work as special counsel, NBC New York reported Wednesday. Rosenstein, who appointed Mueller to the position to investigate Russian meddling in the 2016 presidential election, pointed to the lack of leaks coming from the probe. “When we conduct criminal investigations—just as was true in Maryland—we don’t talk about the investigation while it’s ongoing,” he said. “So what the American people will see is only if and when a case is charged. And there are several cases that have been charged to date.” So far the U.S. Office of Special Counsel has charged at least four people, including former National Security Advisor Michael Flynn and former Trump campaign chairman Paul Manafort, with violating federal law.